Edit: Decided the DSI was the best bet, thanks guys

if rpgs then nintendo dsi.

This is barely a contest.

DSi.

get an original psp, sports game, gta and gran turismo

PSPGO
-larger screen
-lighter
-Final Fantasy Crisis Core is an extremely good Action RPG with a lot of original ideas and any fan of FF7 needs this game
-Jeanne d'Arc is the best SRPG I have ever played. It is extremely well balanced.
-Dissidia Final Fantasy is an RPG fighting game that is really addictive
-Has access to PS1 rpgs on the psn including FF7 and Wild Arms 1 and 2

DS
-touch screen
-closes to protect screen (I put mine in my pocket all the time)
-Lots of remakes of old school RPGs FF1-4
-Other good RPGs (Pokemon, TWEWY)

I think either way you will find something you like. I have both a DS and PSP-3000.

I just got my PSP and bought a 16GB memory stick from amazon for 70 bucks because it has a larger screen than the go and a replaceable battery and if something I want only comes on UMD I can still play it.

DSi for sure.

PSP3000

Go would work aswel.

I think you should give the PSP a fair chance. Crisis Core and Jeanne D'Arc are amazing imo. Phantasy Star Portable and Monster Hunter Freedom Unite are both good games. Original Persona, Chains of Olympus, Lumines, Patapon, FF 1 and 2.....etc.... I know they are not all RPG's, but there are a lot of good games to play, don't be fooled.

Edit: Also Gran Turismo and LittleBigPlanet soon.  And of course the far superior graphics.

Edit 2: Tales of the World: Radiant Mythology 1 and 2, Disgaea 2: Dark Hero Days, Kingdom hearts Birth By Sleep, Star Ocean First Departure and second evolution, Crimson Gem Saga. There is lots of Rpg and all other kinds of goodness.

Definitely a DSi if you want RPGs. I'd actually say no system has ever been as great for the genre as DS. The SNES and PS1 come close, but... wow...

DSi for sure

You see the sales on the front page....yea thats how much the ds is better than the psp.

More games , better games , creative games...all on the ds