All in all, I hope that AMD releases a CPU that knocks the socks off of the core 2 duo. I woud really hate to see AMD become a Cyrix cpu. They are the only compition that Intel has, and no compitition is bad for every one (look at internet explorer pre firefox, 4, 5, 5.5, 6, no changes at all, just diffrent icons).
That said though, if I where to have the money to upgrade I would definitly go for a Core 2 duo. I would just not want to take the risk that amd will come out with a cheaper, faster, processor then intel.