The way I see it, I'll get both eventually, but for me the games and the pricetag on the DS threw it that way.

I'll get a PSP, but the features do nothing for me (I watch films at home on a DVD player, I have an MP3 player), and there are no games to pull me in.

It's all a personal thing, I'd suggest you research the PSP, look at all the games there are and the games slated for release in the near future, as well as how much you'll use and enjoy the features.