If you're gonna go for the air route, I'd recommend these in this order:
#1 Thermalright XP-90C (requires additional bracket)
#2 Thermalright XP-90 (requires additional bracket)
#2 Asetek VapoChill Microâ„¢ EXTREME PERFORMANCE
(tie between the two)
#3 Thermaltake Big Typhoon
#4 Zalman CNPS7700-CU
The XP-90C, quite frankly, is about the best of the best when it comes to air coolers. It's actually about as good as a low or medium capacity water kit. It can also be run quite silent.
The XP-90 is also very good, but you need to run the fan at full speed to get the performance of the XP-90C.
The VapoChill is quite cheap, easily orientated, and cools well. The only reason I don't rate it higher is that I've never used it and the XP-90C is a bit better.
The Typhoon is good, but it doesn't cool quite as well, and it's a bit much $$$.
The Zalman is good, but it's huge, quite heavy, doesn't cool quite as well, and it's a bit much $$$.
Basically, for a good air cooler, you're looking at around $100 after shipping, taxes, etc. All of these heatsinks are available from Big Foot Computers or ADP Mods.
Compare for yourself from this site:
http://overclockers.com/articles373/p4sum.asp
NOTE: Case ventilation will be
extremely important with an air cooler--even more so with your Press
hot..........I mean Prescott
Watercooling kits ranked in order:
#1 One you put together yourself
#2 Swiftech H20-APEX Extreme
#3 Swiftech H20-120-x ver. 2.0
The one you design yourself will, most likely, be the best bang for buck. I recommend these parts: Swiftech 6002, Swiftech MCP 655 (or 650), car heater core, Tupperware reservoir, and Danger Den Maze4 Acetal. This will cost less than kit #2 (and about the same as kit #3), but will also cool your video card. Plus, if you buy stuff used you could save some mad cash.
Kit #2 Features the best cpu waterblock and pump on the market...........but you most certainly pay for it.
Kit #3 is bang for buck if you don't wanna shop around.
Deals on waterblocks are pretty easy to come by on RFD. The kits listed here are available from Big Foot Computers.