I'll back up what's been said about ceramics pads. They generate about as much dust in a week as the standard pads generate in a day. They don't feel quite as linear as the stock pads, ceramic pads really like to be warm but the difference isn't dramatic.
I find that it takes about three weeks for my wheels to get grotty enough to bug me. I drive about 30 miles a day in mixed traffic.
Oh yeah, I got the Hawk pads from Tire Rack and they wear better than the stockers.