It must be the "The Best Version", the patch is optimized for it. Danganronpa_The_Best_JPN_PSP-PLAYASiA - pa-drkzbest.iso. M'kay?
Anyways, the translation is... plain awesome. I can't believe it is fan-translated, it looks so professional that I am almost scared by it. The game is pretty sweet, I really recommend people to give it a try!