Originally Posted by Kashis

You should get the system based on the games you actually want if your sole purpose is gaming. PS3 has been getting more RPG's and will soon have more (I'm looking forward to Resonance of Fate, Enslaved and Castlevania myself).

Believe it or not, DS/DSi has a lot of RPG's and good ones at that. A lot of upcoming ones too (Golden Sun, Phantasy Star, Rune Factory 3). If you are thinking about a handheld then I'd say DS/DSi all the way especially for RPGs.