I love Super Smash Bros. I've played all three games and worked hard to unlock everything. While I think Brawl is my favorite, I do think that Melee is the better game (however that doesn't stop me from playing Brawl every chance I get :3).
I'm not super-competitve either since I play with items on all the time and I don't care about stage hazards or whatnot. My mains change depending on which of the games I'm playing.
Original: Kirby, Mario, Link
Melee: Mr. Game & Watch, Kirby, Marth
Brawl: Mr. Game & Watch, R.O.B., Kirby, Ike, Marth, King Dedede, Lucario, Wolf
Super Smash Flash 2 (because why not): Black Mage, Sora, Naruto, Mega Man, Kirby
Out of all the characters, Mr. Game & Watch is my favorite.