Colors, eh? I'm not too picky, personally. I have an all light-blue set, a blue/grey set, a few white sets with different legends, some black caps, some yellow...
Again, personal preference.
I would say you should check out Imsto's stuff if you want high-quality and affordable. Check out some of the group buys for GMK sets if you want something a bit more interesting and costly. Like you said, there is a lot to look at. Good luck!