I love the Rizoma stuff,and even had a pair of the Circuit 851 on my first XB. Unfortunately, they went with the bike when I sold it as the buyer insisted they go with the bike.
For my current bike, I went with those cheap Hong Kong Oberon knock-offs pictured in this thread. You can't beat 'em for $30, although as another poster said, you do have to get creative with the mounts as they aren't big enough for our bars. Nothing a few wraps of electrical tape couldn't fix though. ;-)