I highly recommend the Lone Wolf hang-on treestand.

http://www.lonewolfstands.com/hang_on.asp

The strap is separate from the stand. You climb up, put the strap around the tree (without the burden of the stand attached to it) at the desired height. Then raise the stand up by whatever means you choose, and simply drop in onto the hook that is integrated into the strap. Add a ratchet strap to the bottom (if you wish) and hunt like a madman. They're a bit pricey, but the hassle you save is worth the price. For what it's worth.