Like most everyone here, I painted my shop walls white. Since I found a deal at the board, I picked up a 5 gallon bucket of exterior-grade semi-gloss white. It is probabaly the most boring mind-numbing color to paint but it reflects the light very very well.
I doubt one would noticed a significant difference between gloss and semi-gloss. Dust will still gather a bit here and there on the walls thanks to our arachnid friends....