Well, it really depends what you are running now. if you have a decent socket A system already, then I would still wait till Barton is out, then just upgrade the CPU. Hammer will almost definately require a new board. Personally, I am not going to upgrade till I can get a dual Clawhammer board with serial ATA. 3GIO would be nice too, I think that even VIA wouldn't be able to screw up a clawhammer board with 3GIO(No northbridge, and IRQ's no longer get hogged).