Is 'looking way cooler' a justifiable reason? That's a reason people give for liking Apple. APPLE! And that tiny analog stick has a nasty habit of breaking.

Also, many PSP games are simply ports of PS1/2 games, so I wouldn't use the PSP's game library as a selling point. But hey, whatever you're happy with, personally I wasn't happy with my PSP at all.

Not that I would waste money on a DS since several high functioning emulators exist for it.

Oh, and you can download DS ROMs onto a flashcard, so that's another point negated.