This is gonna sound a little odd, but I could use some suggestions for NES games to acquire. I mean, I've got the system and all the games I originally ordered now, which is awesome, but obviously I'd like to expand my collection. However, I'm having to do it kinda slowly, because NES games are more expensive now than they used to be (God I miss the days when you could get NES games for like a buck). So anyway, since I'm having difficulties deciding, I thought I'd just open this up for suggestions, maybe that'll help me narrow my selection or something. Otherwise, obviously, there's tons of games I want but it's hard to try to decide which ones to get first.

For reference, here's my current collection:
Super Mario Bros./Duck Hunt (should really get a zapper, come to think of it)
Super Mario Bros. 3
Double Dragon II
Marble Madness
Teenage Mutant Ninja Turtles
Punch-Out
Oh, and a Game Genie (not technically a game, but thought it'd be fun to fool around with, and I always wanted one as a kid)

So yeah, there are tons of games I'd like to have, but I need guidance to help narrow my choices.