Get Rengar. He is ridiculously fun, and won't be receiving nerfs for awhile as he got overnerfed, and they're rebuffing him. You can play him Top and Jungle (and kill lane bot). Tank CDR or glass cannon assassin or bruiser... whatever you want.
One thing though, black cleavers are OP now. --- http://www.youtube.com/TimMH3 LoL IGN: I Am Zyra. Aphoristic (12:31): all you do is b****
Noob Saibot is fun and the easiest champ to make "dem plays" with. Seriously, Ive gone in 1v3 killed 2 and escaped over a wall with the shadow. He also can go Jungle, Top or even Mid and be good at every role. Seriously, get Zed.