Liquid cooling alienware aurora

My apologies to you all if this have been addressed before, but I cannot find anything current. I am very new to Alienware and learning a lot about different computers they have and their specs. I do have a dell computer which is many many years old possible around 10 year plus. I am looking to get rid of my old computer as it’s on its last legs and I want to upgrade, time for a change to a better PC. However I am looking at getting a really good desktop PC which again will last me for another 10 years plus. Right let me get to my question. I am not into overclocking the CPU as would not know what to do and would be scared of damaging the PC so I am looking at getting the new Aurora with the i7 8700. I know the i7K is for overclocking but I see that i7 comes with the Turbo boots technology which reading it auto boots the CPU for overclocking, hope I am correct in saying this. My issue I have do I go for the 850w air cooled or the 850w liquid cooled. I have read reports of the liquid could leak but this seems to be only ones where people have built their own. Therefore if I was to keep a new PC for say another 10 years would this be an issue with the liquid cooling and do you think it would leak after such a long time. I don’t really want to pay lots of money for a good PC not to last because of a leak as it will take me some time to get to buy this one. I will normal only play one or two games (flight sim games) on the PC and use it for normal web searches and office stuff. I would really appreciate your comments on this guys. Thank you in advance for reading this and hopefully commenting on this.