I agree with Bill - you should have a cross wrench (or commonly called a star bar)
and a torque wrench. I doesn't have to be that expensive ($70). Here's one at Harbor Freight that would work ($10):
http://www.harborfreight.com/cpi/cta...Itemnumber=239
With wheels, the main thing is to have the torque even (around 100#) not so much the precise amount of torque. I use one of these for wheels - for engine work I use a better one.