Mix it all a bit. You could always hold a nominations contest for people, so that the top...20 could get in automatically or something. I don't know.
Just balance it. Too much from one game is boring, but it helps keep interest if it's not just all DL stuff or NR stuff. Get some older and odder stuff too.
Suggestions...well, the obvious ones already. OS, FFX-2 (well, ranked, but...)...can't pick too new stuff, sadly. I'd like to see LaL, PQ, and others as well. TWEWY would be fun for migraine inducing joy.
Oh, and ARCANA >_>
Seriously, though, just pick a spread from everything. You need some obscura for fun interest, but the majority should be a mix of DL and NR, probably 40-60 or so.