As a climber newbie I would suggest you seriously consider the Summit stands. While they are certainly not the lightest of the bunch they are probably one of the most secure platforms out there once you are in the tree. Climbing up and down is a snap. I have never felt apprehensive when using my Summit.

After you get some time in the stand under your belt, you will be in a better position to evaluate stands based on their weight, ease of use, etc...
My Summit Viper was the first stand I bought and have never regretted my decision for a second. It is fairly heavy (especially with your pack strapped to it) however you can't put a price on that confidence level going up and down the tree.