I cherrypick aside from the odd few games I can think of here and there, or if there's something specific I want to play.
100 SNES
50 NES
20 PS1
30-40 Mega Drive
30-40 Master System
40 GBA
10-15 GB/GBC
Couple of spectrum, scummvm, Mega CD and pc engine games. I've got a few N64 games but that's more to test what will and won't work, as I have an everdrive and an n64 knocking about still anyway. I tried getting some dosbox games to run but it's so cumbersome it just doesn't seem worth it.