Many models to choose from, depends on what you are looking to spend. Make sure that you get something that you can carry in to your hunting area along with the rest of your hunting gear. I bought one from BPS afew years back an have used it only afew times from whitetails but alot for Moose hunting.
Things to look for: Overall weight, how easy does it pack up, an operation of it.
One of the simplest one that I have seen in the last few years as been the Gorillia Greyback climber. Weights about 18lbs and packs flat and has back pack straps that come with it. Have been looking for one to upgrade my climber.