I'm liking the BlackIbz. Dark and contrast-y in the right places. It has a tech-ish feel, but doesn't beat you over the head with it.
I don't like the giant profile pic on the home page.
Fire, not so much. The brown was interesting for a moment, but distracting.
I like arrangement on Gray Style. (The colors are ok, but not as good as BlackIbz.)
I really dig how Gray Style puts you right into the important stuff on the home page.
It's top navigation bar rocks. If that bar could be put on BlackIbz, it would be perfect imo.
Final call (for me) is BlackIbz. White on black works best for me.
I was using Curve for a long time and had forgotten what the site banner looked like (heh.)
Thanks for running a groovy site