[Kafer_Mike]

I'd go 2 1/2 car garage to allow room for a bench, shelves, and tools (tool box, welder, oven, jacks, etc.). Several other suggestions:

Install a seperate access door.
Plumb for a utility sink. (your wife will thank you :agree: )
Plumb for natural gas for a furnace or radiant wall heater.
Plumb for compressed air with couplers every 6'-10' and 1 or 2 overhead.
Install a floor drain.
Wire the walls with 110v outlets every 6' and seperate circuits on each wall to prevent overloading.
Wire each wall with one 220v outlet.
Wire the ceiling with 110v outlets for overhead fluorescents, ceiling fans (to stay cool/warm and keep the bugs away), and garage door openers.

Hope this helps...