If you don't have the collector's mentality, Super Mario All Stars is a good and handy pack. I bet there's pretty much of those carts around. It doesn't have the Mario World though, I still feel sad I couldn't grab it to my "collection" when PS was introduced and SNES games were for sale + cheap.
F-Zero really rocked my world and I'm still into it, like games that have no specific target age group. Original F-Zero for SNES is still the only F-Zero to me, King league with Golden Fox = woohoo. _|,,/
What comes for ROM's... Thanks to emulating I've been able to play Gundam Wing, Endless Duel. It's such a good game, maybe a bit clumpy, but really cool and I think it's a shame it was never translated into English and was never available outside Japan. If I remember right.
But does anyone remember Jurassic Park II: The Chaos Continues?