I am definaly going with black, colored tint ... IMO, looks dumb on any car.
I'm also going to go with 20-35%... but undecided.... what I WANT would be like 10% on all windows... but what am I going to get hassled for is what I want to not have. Cops DO have a tendancy to pull over and hassle people with aftermarket tint moreso than those that do not. I've heard story after story of people with tint getting the 3rd degree, just cause they have tinted windows.
I'm thinking maybe 20% would be ok. That'll probably be what I go with.