rc makes a good yj kit, especially for the price, and they perform pretty well off road.
2.5 and those shackles will not clear 33's. personally i'd suggest a 4" kit w/ stock shackles. longer shackles really aren't that great. and after that, a little more dough will set you up with a spring over and 33's and thats a sweet set up, rides like stock and flexes like crazy.