What next for my retro game collection?

So I have, what I consider, a pretty modest retro-game collection (at least compared to a lot of collectors).



I collect only for play. So I don't care much about rarity or condition. If I want to play it I'll get it, if I don't I won't.



I'm also fairly picky about what I get just because I could easily spend my entire paycheck grabbing games.



That said I'm always on the lookout for games to play and really appreciate suggestions. Hence this thread :)



Now for the pics:



NES and SNES:







Saturn, GameCube, & Dreamcast:







(I don't own a SegaCD, those just came in a lot)



Genesis and PS2:







PS1:







Master System:







N64 and the lone 32x game: (aka: asshole games with no spine labels)







Alright so you probably have a good idea of the type if games I like (keeping in mind there are a few games here and there I just ended up with) what games do you think I should try next?



One giant hole is SHMUPS which I'd like to get into so I'm on the lookout for good "beginner" titles in that genre.



Thanks :)

What next for my retro game collection?