It really depends on how you hunt. If you do most of your hunting from a treestand, you might be better off with a one piece removable quiver so you can take it off once you're up in the tree. If you like to do a lot of stalking, a two peice quiver may be the ticket. Also there are a lot of guys who spot and stalk that prefer a quiver that is mounted to a backpack like a cat quiver.
I personally like the one peice removable quiver. Depending on your budget, you can get a very good quality quiver from anywhere between 40-100 dollars. Some of the better ones are Octane, Fuse and Alpine. The Octane is very nice, but also very expensive.
I personally am using an Alpine right now. They are very well built and quiet. If I get a good deal on an Octane I may bite though.