If everything falls into place I'm hiking the Appalachian trail mid-april and I would like to replace my standard hennesy backpacker tarp for something a little bigger. I realize the standard is very light, and it can totally be effective when setting up shop in a good spot, but I want that extra peace of mind and "living space". I'm pretty set on an OES standard....bigger but not too big and in my budget. I have a few questions about it though, what is the difference between silnylon and spinnUL? I can see that one is a bit lighter, but anything else that would make it important to spend that extra $50? Also if I get the standard is it necessary to have panel pull-outs? From what I understand they are usually in the middle to keep it from sagging in on the hammock...that right? Thanks a lot!