Thanks for everyone's input. I am not really too worried about safety, I can handle a fall or 2 if it ever came to that as I am normally not very far off the ground. For me it is more about comfort and whether or not my weight will make a lighter fabric stretch so much that it is no longer comfortable.
I'll need to go check out some of the links you guys posted. I'm trying to decide between a gnome, thunderbird, xlc blackbird, or night owl. I'll check out the list and see if I need to add any more to the comparison. It will take me a while to save up the money, hopefully I might find an opportunity to try some of them out to help me make my decision.
I have a sneaking suspicion that I might be getting a ENO Doublenester for my birthday in a few weeks, as it is on my Wish List at REI and my wife knows that I've been pining for a better hammock. I'm sure that will get me through my waiting period to save up for something better.
Thanks again for sharing your experience.