What are the best emulators for these?

I just got the PSP and I'm looking for the best emulator for SNES, Genesis, and NES. I already know the best emulator for N64. I also heard you can now play these legacy systems over wi-fi, thats sweet. So obviously recommend me an emulator with wi-fi capabilities. Thank you in advance.

http://www.dcemu.co.uk/vbulletin/showthread.php?t=19867

Is the second post still fine even though its nearly a year old? I assume there have been emulator releases by then.

SNES = SNES9xTyl 0.4.2. Me++ (Ruka's new version)

GENESIS = DGEN 1.70

NES = Nesterj 1.20 beta 2

I'm not asking for the ROM but what are your favorites to play over wi-fi? I could imagine Contra 3 being awesome for SNES.

Pretty much any of your favorite games

I like playing Spiderman Separation Anxiety and Super double dragon

Mario Kart is ok but its kinda messed up

Street fighter is tight

Secret of Mana series would but real fun to play aswell