I'll say go for it, if there's enough in the library to hold your interest. Also, go for a Vita rather than the PSTV; since most Vita games don't work with it, you may as well just get a PS3 instead. 32 GB is all you need, too bad it's disgustingly overpriced. Some cool accessories can be found on Amazon - I've currently got two cases, one for protection (when it leaves the house) and one that makes it feel like a proper controller (for in-house play).
Currently playing Gravity Rush, Luftrausers, Duke Nukem 3D (PS+ game, more fun than I remembered), and Half-Minute Hero (great & goofy PSP RPG).