Intel rules the roost right now as far as dual-core is concerned. Phenom is releasing in a couple of months and performance is rumoured to be better than the Core 2 Duo. But the Penryn will also be releasing around the same time and will be the main competitor to the Phenom. If you get the GigaByte board above, you'd be able to upgrade to DDR3 and Penryn processors but for using Phenom with DDR3, you'd need an AM2+ motherboard, which are not yet available.