The one nice thing about the TV Out cable for the Go is that you can now use the Dual Shock 3 to play games. Of course there is the problem of not being able to charge while using TV out, but maybe Sony could that out by it's release.
I'm sticking with my 2000 but will be buying PSP games on PSN from now on. I will probably buy a Go, or some iteration of the Go, in the future when the price is much lower, but at $250 and an unknown way to play my dozens of existing PSP games, isn't really worth it yet. Actually, I might pick up a 3000 now that its been hacked.