DSVWGLI,
Definitely go for fluorescents - you won't regret it. I have a standard double garage with two double 5ft fluorescents over the center of each car, front and back - that's 8 altogether, and it's great.
I can't remember the exact wattage, but they are the brightest I could get, and are daylight temperature. You can never have too much wattage. My garage is also painted flat white, walls and ceiling, for maximum light reflectivity.
I started off with a tripod halogen along with two 200w ceiling bulbs, but got the fluorescents installed immediately after backing one of the cars out pulled the cord and caused the light to fall against the door. Expensive repaint! Don't have stuff in your garage that moves, because your cars will attract it like a magnet.