Intel are going to be a better chip at this point. AMD will be cheaper (and possibly a better price/performance). But, it's not all just more Ghz the better, check out the CPU charts here and compare. See which one has the best spec for the amount of money you want to pay. AMD MB's are usually a bit cheaper than Intel ones, and they seem to be upgradable for future CPU's better than an Intel platform.
http://www.tomshardware.com/charts/2...hmarks,60.html
All that said, if I were buying a new computer it would likely be an Intel at this point...
Joel