I wonder if you gave the Hennessy a real trial? It doesn't feel like a stretchy plastic bag when it's hung right. Hanging is about 90% of the comfort of a hammock. You can get an ENO from REI for forty bucks but it's not an asym like a Hennessy; I like to lie flat and roll around in my sleep. Maybe a Bridge Hammock would suit you better - check out Jacks R Better.

I have been looking at throwing together a silk hammock for summer - something like this. The materials can be had for about fifty bucks depending on where you get the cord and silk. Joann's Fabrics is having a killer sale right now thru the 21st I was going to check out. You can get polyester cording from Lowes and Guttermann's thread at JoAnns as well. I followed the link to Thai fabrics from the url above and the silk for the hammock and bugnet would cost me about forty bucks.