Emulation help?

I just need to know what the best emulator for GBA,Snes, and Genesis. And what i need for them to run on my psp fw 1.5 when i get it. I would search through forums and stuff, but i've been really busy lately with work and and school. Thnx in advance. I'll be using the newest devhok with my psp also.

you will want gpsp (requires a gba bios, have to google it) SNES 9x TYL and in my oppinion DGEN for you megadrive stuff, also check out the work by NJ cps1psp, cps2psp and mvspsp for capcom and snk arcade emulation, top notch work!they should all have 1.5 brew versions knocking about on DC-emu i think.