I second this. At your height, you're probably going to want to go for an 11ft hammock, and definitely nothing shorter than 10ft (which many of the ones on Amazon are).

If I were you, I'd take a serious look at one of these Wildhorn Outfitters "Outpost I" hammocks. I don't have any experience with them personally, but the review score is solid and $40 for an 11ft hammock w/ aluminum/wire-gate carabiners AND a cinch buckle suspension system is a pretty fantastic deal.