I'm designing a liquid cooling system for my next pc project (still a ways off with teh monies and all, but planning is still fun

instead of normal liquid to air heat exchangers i want to add a peltier cooler to the unit so it looks like:
[-----------------------]
[---------[fan]--------]
[----[air heatsink]---]
[----[peltier chiller]--]
[-> [water block] -> ]
[------------------------]
the problem i'm having is finding a part for the water flow that has a flat top instead of fins ...
using this active heat exchange because i'm going to have everything cooled on the same line (cpu gpu ram hdd etc...) and do not want to hear a 6-8 fan radiator along with wanting to keep the liquid temp about 10C below ambient

also using an peltier cooler on the cpu block (going to keep a load temp around 0-5 C)
so if anyone can find a heat exchanger that a flat peltier modual and heatsink can lay on top of that would be awesome