I think the Go is also quite a bad idea, its obvious that sony are testing the market for downloading games from their PSN store.
I got a psp2000 and barely use it for games due to not enough quality, and at least i can trade in the old titles that are on umd when i need funds to get something else.
too bad if you purchase a psn game and its rubbish your stuck with it and at least you pay the same price but with no box or manual.
oh whats that? smaller screen on the GO, pftt whats the point really