If you have enough money for buy that and pay the bill every month, go ahead.
You need insulate very good the motherboard and components since condensation is always present. Today you can find very good components to do that.
Now my question is. Do you really thing that you need the phase change?
My wife has given me pretty much a blank check (waits for laughs about wife controling the money to die down) so I have the money this is my big splurge which is why I am taking so long to pull the trigger I want this one to last me for a while, do I need Phase Change Nope I don't even really need Water cooled I am a mild Over clocker don't really care if someone else I don't know has 3 more points on a benchmark I don't care about but what I do want is long running stable and Quiet if my 3930k hits 4.2G I will be happy