I've been doing some heavy reorganization in my living quarters, this includes finding a way to make a retro console 'station' on some floor space I was able to clear. Currently my NES and SNES are hooked up. With renewed interest in older titles on my older consoles, I realize my library is very, very lacking.
Here's a list of my titles.

NES:
-Teenage Mutant Ninja Turtles
-Mario / Duck Hunt Dual Pack
-The Legend of Zelda
-Top Gun (LOLOLOL, when the fuck did I get this?)

SNES:
-Yoshi's Island
-Super Mario All-Stars + Super Mario World
-Super Mario RPG: Legend of the Seven Stars
-Killer Instinct
-Donkey Kong Country
-Donkey Kong Country 2
-Donkey Kong COuntry 3
-Mega Man X N/A
-Mega Man X 2 N/A
-Mega Man X 3 N/A
-Kirby Superstar N/A

So then, I ask you, what should I add to my library? Though I've played many in recent times in compilations/emulations, I missed out on a plethora of classics back during their original run. I'm hope to add some to my library without breaking my wallet.
What are Your Top 3 Classics for the NES & SNES that I should look into purchasing?
And, no. No Final Fantasy or Chrono Trigger.

-zZ Later Zz-