Regret selling Paper Mario 2. Pretty much the best Mario RPG.
Man, Paper MArio 1 & 2 sapped away sh*t loads of my life. It was an epic game, everything you'd want from an RPG, and features the almighty MARIO! great game.
Personally, I go back quite often and play my older games. I'm currently doing another run through FF7, 8 & 9, as well as playing others such as LoZ:Lttp, Rock n roll racing, Paperboy (mentioned before, epic game!), Paper Mario, Minish Cap, Goof Troop, a few others. These are across alot of different formats!
Also, I loved the SNES. First and best console I ever played. I also had the gameboy player, and loved playing some Zelda on my tv. Also loved Super Metroid, Mario Kart, Mario All Stars, Mario Paint, Killer Instinct, Super Ghouls N Ghosts, all on the Snes. Theres a heap more too!