Good Evening Everyone,

I'm looking to upgrade my X51 R2 as much as possible. I purchased it several years ago and would like to 'update' it so I can play more modern games on higher settings (mainly use it to play Elite: Dangerous right now.) I'd really appreciate some advice on how to go about this. I'll be using the machine purely for gaming. Here is my current stock setup:

Item	Description
Base	Alienware X51 R2 Standard Base
Memory	8GB Dual Channel DDR3 at 1600Mhz
Keyboard	UK/Irish (QWERTY) Alienware Multimedia Keyboard
Monitor	No Monitor
Video Card	1GB GDDR5 NVIDIA® GeForce® GTX 645
Driver	WLAN Card DW1506 Driver
Hard Drive	1TB (64MB Cache) 7200 RPM SATA 6Gb/s
Chassis	Matte Stealth Black with Dark Chrome Accents
Operating System	Windows 8 64bit, English
Mouse	Alienware Standard Optical Mouse
CD ROM/DVD ROM	Slot-Loading Dual Layer DVD Burner (DVD RW, CD-RW)
Wireless	DW1506 Wireless-N WLAN Half Mini-Card
Cable	UK 250V Power Cord
Documentation/Disks	Ship Docs : Eng
Bundle	D00AR201
Extended Service	1 Year NBD with Premium Phone Support
Placemat	Documentation (English, French, German, Italian, Dutch)
Documentation	Documetation not included
Order Information	Alienware X51 R2 Order
Processor	Intel® Core™ i5-4430 Processor (6MB Cache, up to 3.2GHz with Turbo Boost Technology)
Color Choice	AlienFX System Lighting - Mars Red
Accidental Damage Support	No Accidental Damage Protection
Packaging	MOD,SHP MTL,RTL,ANDR,EMEA
Online Backup	No DataSafe Online Backup selected
FGA Module	ANDRO1403_002/1405_003/BTO
Online Backup Software	No DataSafe Online Backup selected
Optical Software	Cyberlink Media Suit Essentials DVD
CFI Included (Smart Selection)	CFI not included
Hard Drive Software	Not included
Retail Drop in the Box Leaflet	Retail Drop in the Box not included
Retail Information	Retail Info not included
Retail Tech Sheets	Retail Tech Sheets not included
Microsoft Application Software	Office not included
Protect your new PC	Anti-virus not included
Power Supply	240W AC Adaptor

I understand that the first thing I'll need to do is upgrade the power supply to the 330W adaptor. However, I was wondering what is the best possible supported graphics card I could get? If anyone could provide links to recommended models that would be fantastic. Also, would it be worth upgrading the CPU and/or memory too? Many thanks in advance for your help!

Best Wishes,

Daniel