you should buy 466 mhz to do that, 400 will not push it unless you lower the ddr ratio to 1.6x200 fsb
abit is7 i hear is mad overclocker, so is albatron's 865 pe version
right now i have a p2.6c@3.2 ghz with some corsair 3200 at 395 mhz
mushkin, kingston, corsair, and ocz are all very good