The best mod chip for its price is to actually soft mod your Xbox. It costs nothing except time reading up. Check here
http://forums.xbox-scene.com/index.php?showtopic=215055
The best emulators in my opinion are,
N64 = Surreal
Snes = xsnes9x
Nes = Fce ultra
Ps1 = Pcsx Xbox
Atari 800 = Atari xl
They all run full or nearly full speed.
You can find out more information here
http://xbox-emulation.dcemu.co.uk/
or
http://www.xbox-scene.com/
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