Though I agree with a lot of people that two top and one bot is a better idea (better jungle and dragon control, harder for the enemy to gank, etc.), I understand that at lower levels of play, and in normal games especially, the standard is that a bruiser or great sustainer goes top, and a ranged + tank/bruiser (or support, if you're good enough) goes bot.
Of the champs you listed, AP Sion and AD Panth are a great combination. Olaf and Nunu work well, too. In fact, Nunu is so good in TT that you can pair him with most melee or ranged AD and he'll do well.