Which TZ out of here 46u?

http://www3.towerhobbies.com/cgi-bin...+.18&search=Go

And how are the diffs, do they hold up enough? I want some awesome power outta the TZ. Want to be able to whip the wheelies on demand and stuff when thrashing.

Do you just need the rear diff GPM case parts off ebay or the carbon ones from HPI. Also theres aluminum diff cups now, they look to be a good investment aswell.

Thanks for your help 46u.