Hate to say it dude, but the 3DS is quite a bit more powerful than the PSP. A lot of the games out now only look slightly better than what's on the PSP, but in general the 3DS is even more powerful than the Wii (but all things given, that's not exactly saying much). If you look at Resident Evil: Revalations, you'll find that those graphics are pretty phenomal for it being on a handheld, and to most viewers it wouldn't look out of place playing on the Vita. That said, it's gonna be pretty rare finding future games of that graphical quality on the 3DS, but as a whole, RE:R should give you a good idea of just how much more powerful 3DS is over the PSP, and even the Wii.
And just to put it out there, you can quote technical specs all day, but in the end it's how the games look that tell the real story.
I don't know why people tell me to get a life. I'm a gamer, I have lots of lives!
