I got the Park Roll-Up toolkit as a starter set. I had a starter Craftsman tool set as well that helps a bunch.
I since added (mostly as needed):
-Ultimate Work Stand
-Ultimate wheel truing stand (still not real comfortable with it)
-Hozan lock ring pliers (awesome...I even used them on my sink!)
-Shimano freewheel remover
-Suntour freewheel remover
-Stronglight crank remover
-Minora aluminum tire levers
-extra cone wrenches
-Nashbar torque wrench