Thank you kindly for the reply and im very happy to hear your experiences have been well! 

The model that im looking at with the 15% off is just before the top spec model. 

I was thinking of optioning the GPU to the 2080 Ti which i believe bumps it up to 11GB?, Win 10 Pro, 512GB SSD and with the Blu ray burner.

I noticed the CPU cant be optioned on this model to the overclocked version but should i be concerned with that or not really? 

I love alienware and I have all their accessories and I've never had a problem with them. I also have an Aurora R7 for a little over a year and I've had no problems with it (knock on wood) so I would say to do it. It's so easy to upgrade the auroras I've already upgraded the power supply with no problem and the case seems very well made so I would say to go for it. 

Cheers thanks for that.

I wouldnt really worry too much I'm upgrading my gtx 1080 to the rtx 2080ti and my cpu isnt the overclocked version but it will still run everything fine. I wouldnt worry too much about that 

Once again thank you so much for the detailed and very informative reply!

Yeah if i am to be honest overclocking for the CPU is not a major concern for me. I normally dont like to be messing around with settings in my PC's. Im happy to spend a little $$ at the start and get a rig that i wont have to stress about for the next few years at least.

My primary game that i need to be logging in at least once a day is Star Trek Online...it was the main reason i purchased my X51 at the time to retire my old Sony VAIO laptop that i found difficult to game on....at the moment ive had to go back to the VAIO in order to be able to successfully access Star Trek online without the fear of the X51 continuously crashing/freezing.

The only other game at the moment that i still have not even be able to test properly is Star Citizen hence why im trying to go with the higher tier model GPU as i know that game is going to be heavily taxing on the entire system.

Im hoping for the noise fans that perhaps not going with the overclocked CPU perhaps it will help with the noise levels being a little lower? I mean if when gaming the fans get a little high that i can tolerate but what would be annoying is when at idle and say using Microsoft Excel for work and the fans are going nuts then that would be upsetting

I know the solution as you have mentioned to upgrade the fans is an option (if the noise issue occurs) but i really dont like messing around and pulling things out of a new PC. Im just always stressing im going to screw something up my self and makes things worse LOL.

Ive got another dilemma now also....im really keen into the 34 inch curved Alienware monitor to match for the Aurora but i know if i go down that path set up ill loose the option if keeping my PS4 Pro at my office desk as well.

No speakers plus no support i think for 21:9 screen from the PS4 Pro.

Ahhh too many choices to make hahaha.

WOW very cool set up!

I wish i had the room to be able to run a setup like that.

Buy a 330w POWER brick for your X51

https://www.amazon.com/Dell-Adapter-DA330PM111-ADP-330AB-332-1432/dp/B00CGA5JQM/

Buy a GTX 1050TI for your x51

https://www.amazon.com/ZOTAC-GeForce-DisplayPort-128-bit-ZT-P10510A-10L/dp/B01MCU1ERO/

Use a clean windows 10 DVD and install 10 on your X51 using brand new ssd.

https://www.amazon.com/SilverStone-SDP09-2-5-Inch-3-5-Inch-Hot-Swappable/dp/B0049MPQDG/

https://www.amazon.com/Samsung-Inch-Internal-MZ-76E1T0B-AM/dp/B078DPCY3T/

https://www.newegg.com/microsoft-windows-10-pro-64-bit-reinstall-recovery-disc-only-no-license-key-included/p/N82E16832350238

https://www.youtube.com/watch?v=AcE4DW5lku8

After that you may find you don't need to buy a new PC.

@Chris-WH:

Im hoping for the noise fans that perhaps not going with the overclocked CPU perhaps it will help with the noise levels being a little lower?

It depends. CPU SKUs are partly driven by silicon manufacturing health. Even on the same wafer, different dies will perform differently. When the differentiation in performance and power is negligible, it becomes a silicon lottery where the parts are sold as a single SKU to end users, and then we try to bump up some voltage/ frequency to different end results. Some people get better boost than others.

When the difference is significant and reproducible (i.e, for every X wafers, Y really good dies get produced), those stellar dies become your higher binned part. When the silicon manufacturer is very sure you can safely overclock a part, it then slaps on an "unlocked" label and sells it for an even higher price than a "locked" part. For most instances, we can safely assume there is no way to magically make a locked part unlocked.

So why this long lecture? It's because an unlocked part is more likely "healthier" than a locked part. That means an i9-9900K would be of a healthier process than i9-9900. This would in turn translate to hitting iso-frequency at lower VCC which means lower power, hence less heat. This doesn't mean that the K processor will always run cooler than a non-K but if you were to ask me to bet on either one, my money goes to K processor being better at hitting frequencies with lower voltages or ramping voltage and frequency to finish bursty workloads and going back to low power idle.

If you haven't fallen asleep by now, I want to remind you that Dell will keep singing you the you-never-bought-a-factory-overclocked-system-from-us song whenever you contact tech support about your non-K system. I just experienced that last week when I reached out on not being able to overclock my gaming DRAM on a system that just has an i5-9400. Just something to keep in mind.

And yes, please get 850W + liquid cool. The PSU is modular so remember to plug out the unused cables. I wonder why Dell shipped them all plugged in and choking the airflow.