if money is no issue, and this isnt a air setup, id get the CoolIT liquid cooler. Its all pretube'd and preleak tested, and the coolant stays good for 2 yrs. it has a heavy price tag tho of around 399 dollars, but it will blow away even the high end water cooling setups that dont use TEC.
The design on it uses TEC to chill the res. Reviews and demo's showing it keeping a prescott at 27 degree's idle on full setting.
Personally, i might think of it as a upgrade solution because it fits all nicely in the case. But at that price most people will go with phase change. But phase change has problems with condensation and such.
Personally you should check it out, another good fix is the coolmaster aquagate mini. A lot of good reviews have come out on that cpu block.