[lux hauler]

My garage is 24x24. I used two 4' flourescent shop lights (the kind with plugs.....just wire outlets to the ceiling) on both side walls, one on the front wall and one on the back wall and two 8' high output fixtures to take care of the shadows in the middle. It works really well. I could use one more 4' fixture against the back wall to help with light under the hood. The 4 footers are hung at an angle towards the middle of the garage. That way no light is wasted lighting the wall. Everyone told me that would never be enough but I've never been short on light (unless I was under the truck ). Your shop being a little bigger, I'd go with three 4 footers on each side wall, two front and back and four 8 footers.
I wired the 4 footers on one circuit and the 8's on another......two separate switches.