I'll have to try Ryze.. been out of town for a week so haven't gotten to play much.. just hit lvl17.
what's the opinions on Warwick vs Olaf vs Udyr?
I personally like Olaf best of the three.
Warwick: Great jungler (doesn't need smite), early dragon kill possibilities (level 4), great ganker at 6 with his suppression (biggest problem is his weak gank skills at 4 when the jungle is first cleared), weak late game because he's so squishy.
Olaf: Great Jungler (doesn't need smite), I've taken dragon at 6 (I've not tried earlier), solid ganker all game, excellent AD carry all game due to hit ult.
Udyr: Decent jungler, dragon can be killed at level 5 with help, (7 solo), great ganker due to bear, and solid initiator/off-tank/anti-carry/backdoor champ all game.
Personally I like Olaf > Udyr > Warwick mainly because of the late game potential however a good warwick can win the game long before that matters.
Edit: I should note that Udyr is the only one that is gimped by not starting at blue which is a nice advantage in that your team doesn't need to guard you.
Edit 2: While WW and olaf don't "need" smite, they are much faster with it and thus I never jungle without it.