This is what I have on my Ram, and it's in your price range:
http://www.extang.com/docs/revolution.html
Very happy with it.
It's low profile, it rolls so far forward that I can put the mx bike in the bed of the truck and still shove the front tire on the front of the bed without pinching the rolled up cover. The tire does press on to the front frame of the cover, but it's a hefty piece so it's totally fine. Also, with unscrewing one nut, and pulling on a latch you can remove the entire rolled up top in an extra 10 seconds.
I get pretty much no leaks in the bed.
The cross bars slide in to little brackets as you close it, and the pressure of it being closed keeps the sides sealed on the top of the frame/box.
The closing mechanism at the back is good, it just snaps closed. To open it, just pull on the tab on either side of the rear rail and just roll it up.
This also makes it impossible for someone to break in to, aside from cutting the cover. I had someone try to pry it open over night in Ottawa. They only manage to pop one rail out of a clip (that was only possible because I hadn't adjusted it properly due to laziness) but they still wouldn't have been able to get a hand in there. Once I adjusted the clips properly, it would be impossible to get one of the cross bars out.
I opened it the other night in -20, covered in ice and it closed and sealed back up with no issue... And that surprised me, as we all know these soft ones can be real issues in the cold.
There is a frame that mounts to the front and sides of the bed. The actual cover is attached to a front rail, the middle rails and the rear rail. It can all roll forward, and the front rail disconnects easily so the entire cover can be taken off in an instant, minus the mounting frame. The clamp that holds the front rail on is the only thing that gave me an issue. One side is a normal tab/release which is sturdy, but on the other side, it's a bracket with a wing nut. When you want to remove the rolled up cover, you unscrew the nut enough to loosen the bracket, then pop the release and it's off. But, this bracket wasn't made with the strongest of material, and over time, the tension of the cover slightly bent the bracket and pulled the front rail up a bit. I may have the automatic tension springs set too tight that caused this. All I did to fix this was attach ratchet straps to the front rail and to the tie downs in the box. But, you may not have the issue, as it might just be the tension I have it set up with.
If it wasn't for that one small issue, this thing would be PERFECT. No messing around with snaps, no velcro to get all messed up. It's solid!
I will never, ever own a hard cover, a tri fold or any of those self retracting covers, simply due to the fact that I need to use my bed as a bed and that includes hauling bikes/sleds.
Sorry for the lengthy description, but it's a real world review of it.
