Depends on what you want to do with it. For heavy video editing, get as many cores and as new a CPU as you can afford. For Web browsing, word proc, etc., a low- to midrange dual-core CPU will do. Intel's Core2 Duos are still out there, but the newest line is the i series (i3, i5, i7). Without checking, I'm not even sure Intel makes a dual-core Celeron any more. ... AMD is mostly low-end, although their quad-core Phenoms are nice high-end chips. I just built myself a triple-core AMD (X3 440) Windows 7 box and have been quite happy with it. ... To compare CPU power, check out the Passmark CPU charts at http://www.cpubenchmark.net/index.php and look around at http://www.tomshardware.com/us/