>>1
AMD will most likely be bringing out their 65nm chips around christmas time, and Intel will be releasing Conroe toward the end of the year as well. AMD's 65nm chips will be obsoleting the AM2-remakes of their old 939 A64's. Intel's Conroe will be obsoleting their Presler and Smithfield chips. YOu can wait until the end of the year and get the latest greatest and build a machine with no obsolete hardware, or buy now. If you buy now, old 939 CPU's perform better than the AM2 CPU's currently available, but AM2 will get you a better upgrade path, as you'll have the latest socket type. If you but Intel, Presler 930 or 940 are your best bets. They'll be obsoleted by Conroe, and can barely compete with the low end X2's, but are much cheaper, and can overclock like no other processor you can get under $400. Seriously. The Presler core is capable of 5.5GHz stable, 6GHz unstable (can post and boot at 6GHz). Preslers also have the biggest cache available right now, at 2mb per core (dual core). An AM2 or LGA775 build with a cheap CPU (like a Smithfield 820 or a Sempron 64 3000+) could get you by until the new CPUs come out later this year, with minimal expense on the interrim CPU.