I've got 32gb on my psp
Mostly I'm playing PSX oldies. Right now it's FF7 (again), as I just got done with Crisis Core not too long ago and it's nice linking the two together.
But as far as PSP games go, I'll be getting into:
- Dissidia (I haven't quite burned out on this yet)
- Disgaea 2 (huge timesink, and my time is so very limited. can't see this working out too well for me...)
- Yggdra Union (liked the GBA version better but this isn't terrible...)
- Crisis Core (beat the game on normal mode, but I have yet to NG+ on hard mode.)
- Rock Band Unplugged (it's at the bottom of the list for a reason...)
Then for PSX games...
- FF7/8/9 (Taking my sweet time. Whenever I rush I end up burning out and never going back to the same save file)
- Megaman X4/5/6 (Loved pretty much every title in the series except X7. That one can go to hell)
- Resident Evil 1/2/3 (So nostalgic. There's something about not having enough bullets to kill everything that makes the game so awesome)
- Legend of Mana (This game really shines on a handheld)
BTW, for that 32gb, I use this:
http://www.amazon.com/gp/product/B001H1JF16
Along with 2x 16 gb microSD cards. Combined with various emulators, its the best way to keep my entire gaming history in one place