Bow sights. Which kind should I get?

I'm getting a new bow and would also like a new sight. I bowhunt 100% out of a treestand. For this reason I was looking at pendulum sights. Reviews on them were mixed. Some people seemed to like them, while others hated them. I have a 3 pin sight now, but don't like it mainly because I'm horrible at judging distances. I can be off by 5-10 yards on a guess, and I can't afford a rangefinder. I would be open to a single pin design, but that limits my options right? As of now I can shoot to 25yds confidently, and 30yds pretty easily too. I don't want to have to p up a deer at 30 if the single pin is only good to 20. Any suggestions/help? Thanks.