I've owned an intel, amd and a celeron D. All have done just fine, and I believe that if you're just going to do the "typical" everyday computer use, like browsing the internet, viewing the photos that people send you on email, the occassional card game or online games (flash, java etc.), word processing (writing letters with MS Word) and viewing videos, than a Celeron D will do you just fine. If you're going to get into games, then you might want to go with something faster, like an intel or amd, and a good graphics card.
TBH, I've got a celeron D (2.93 ghz 533mhz fsb) and it works fine. I play some high end games too, like farcry, LOTR, CnC Zero Hour, guild wars and F.E.A.R. all in the highest settings, and my computer doesn't lag. Of course, I have a good graphics card too.
Depending on your need, you'll have to make an educated decision
For people who just want to browse the internet and do basic, non graphic intensive or 3D intensive programs, I usually recommend that they get a cheap Dell for about $400. It does just fine for what most people do.
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