I vote for Fizik as well, though I've only used the microtex "soft touch" type. Mine is also a dark silver-gray, so I've never tried to clean it in the several months I've had it. I know a few others that also use it and like it a lot. It's not super thick, looks nice and stays pretty clean on its own (and is easy to clean if you feel the need), and has a good grip. The soft touch feels really nice, like superfine brushed suede or velvet. The regular microtex comes in plain white. The soft touch is available in white too, but only with the fizik logo printed all over it, last I checked anyway.
The Lizard Skins tape is another one I'd love to try, it seems like it has the best grip. It also comes in white, but it's pretty pricey at $30-40, compared to most other bar tape (besides leather).