Let's just drop this; it has nothing to do with the main topic and nobody benefits from arguing about it.
For what it's worth, I do not have a PSP of my own, but it has many great exclusive titles that are worth playing. For that reason alone, I plan on buying one when I have the money (it is also the only current platform I don't own). Personally, I don't think the PSP Go is worthwhile. Downloading games and storing them digitally is great, but it shouldn't be the only option. I don't understand why companies seem to think that an upgrade should remove a portion of functionality.
When I get myself a PSP, I'll be getting the 3000 because I prefer having the option of using physical games. I also prefer this version's shape/design and it is easier to install homebrew applications for further customization of the interface.
P.S. Everyone I know who owns a PSP says it's worth the money.