I use an API Grand Slam and my son uses a Summit Viper. Both are good stands and both are comfortable.
Get you a good harness. Not the ones that come with the stand, but go buy a good one. I use a Hunter Safety System that's got some pockets on it, but it's not the full vest. It's just like putting on a shirt, no trying to figure out 'which way is up'.
I fell out of a tree stand, wasn't wearing a harness, and it's no fun.