if you're going to be doing any multimedia encoding, go with the P4. my 2.4GHz barton takes about 4-5 hours to encode a dvd. my friend encodes dvds on his 2.8 P4@3.1 in 12-15 minutes (XP).

i'm looking into hyperthreading in linux, and if it's workable now, that is definitely the way to go for multimedia and 3D. anything else, gaming, content creation, office apps, etc. -- A64.