The the emu's i use are
MAME - multi platform
GPSP - GBA
PSP MASTER - sega master system
It all depends what roms your wanting to play there is a big selection on the home page left bottom of screen.
As for firmwares Personally i prefer 3.03oe-c mainly cos of its customizability and is a fully functional firmware which removes the need for devhook and you can also play your ps1 games on custom firms you need to rip them and convert to eboot so popstation is an ps1 emulator and thats built in, there is 3.10oe also custom same features but has more support for ps1 games in PAL format whereas the others use NTSC only drawback with 3.10oe you cant customize top menu and popstation stops working when you apply some custom fonts, I hope this helps you make a choice but whichever custom firm you choose you have made a good choice.
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