Is this an old thread? Sounds like it should be so I'm not sure if I've answered it before. But I don't have as many systems as I used to so the ones I now have less than 30 for would include...
Nintendo DS...I think I have 23 to 25 games for this one.
Atari Jaguar...I have somewhere between 22-24 for this one.
Surprisingly enough, that's it. Next lowest would be the PS2 and I have something like 44-45 games for it.