I am considering adding a bipod to my rifle this season. I have never used one and I need recommendations as to what the best options are. First, What height range should I be looking at? I plan on using it solely in the prone position. Second, I'm looking for a quality built and functional unit that is priced reasonably. Third, it needs to mount to the rifle easily preferably to the sling mount so I can use my sling and remove it quickly if need be. Suggestions???