Paladins? Haven't had the opportunity for ages - the DM of the game I play in banned them back around 1985. I tried one in a 3e game I was in but it died the death in its first battle. I'm generally too chaotic of a player to do justice to a Paladin over the long run but every now and then the mood strikes to try one for a while...if I could. That, and the current party in that game would run a Pally out in no time - alignment-wise it might be the most Evil party I've ever seen.
Monks? This is the only class I've never played, mostly because I just can't get into the whole martial arts thing. The alignment restrictions don't bother me. One of these days I'll have to run one out if only to say I've played every class in the game...but it won't be this day.
Clerics? Love 'em! Played dozens. Bringing a new one in tonight, in fact; if that's the party we end up playing - the main party is splitting in two and I have a character for the other side. (still trying to dream up a personality for the new cleric that won't bore the hell out of everyone - the CG deity's main points are strength and silence, so by default it'll be the strong silent type unless something else leaps out - maybe I'll base it on some Clint Eastwood character...)
Lan-"feel lucky, punk?"-efan