I have the extang revolution and I love it so far. It has a nice low profile look and doesn't have Velcro or snaps. I think I paid $435 for it. It was a super easy install too!
I went with the extang revolution on mine.. awesome cover! Took maybe 1/2 hour to install and doesn't have Velcro or snaps. I had a retrax on my last truck, but love having the entire bed now. Cover stays nice and tight and is low profile too.