I've always been a fan of just about any shirt the Technokats wear... I like the blue and red combination. Orange stands out pretty well, too. I am of course, partial to black and white, though
I think our shirts stand out and are very distinctive because of the contrast between the black shirts and white letters. I know I'm cheating a bit by mentioning my own shirt, but I do like ours, and I did mention other colors first.