Yeah, basically if you are a gamer or along the lines of a gamer you won't make much use of the dualies as single threaded processors will still clean in single threaded processes.
AMD says they'll have "gaming" dualies out by 2006 which seem like a good upgrade option when that time comes.
Until then however, a nice San Diego core seems like its fine for me unless dualies are affordable and just too good to pass up. I have a feeling they will run hot which I don't exactly care for though.
Avatar update though.