Adam build your own.
Its about time you actually build your own.
You have way more then enough budget for a LC system which u can migrate from new build to new build.
95% of everything u buy now is transferable onto the new system.
1. Pump : get a real pump... dont settle for AIO junk which most vendors use... A Laing DDC, or Laing D5, is a much more reliable then a AIO pump. And u can move that.
2. Radiator : get a real radiator (copper / brass) and not a AIO aluminum radiator which has the potential to corrode over time. Also they add a LOT of glycol based mix to prohibit the rust, which reduces overall cooling potential.
3. Block: A Real block has complex and very well machined microfins. Something AIO's dont have.
4. Customizable to your needs : i bet once u get wet, you'll probably go massively overkill from addiction. I dare you to try to go real water!
Everything i listed is transferable.... its only when u watercool things like the GPU which arent, as they are PCB specific, however GPU load temps are effectively reduced almost by 1/2. Yes, that means ur 80C 780GTX Ti's will most likely load around 40-55C at most in QUAD SLI config.
If you decide to get a full board block, that also isnt transferable, but isnt required.
So do a bit of research and go on a full custom.