-the GG lightrek 3 poles are actually a new and improved pole gossamer gear just reccently started offering.. not 3 trekking poles :P. first there were the lighttreks, then lighttrek plus, now lighttrek 3's.
If you havent seen them yett, you should check them out on gossamergears web site, they are lighter than the lighttrek plus, but are stiffer and stronger also.. amazing.
-interesting idea about the tarp also, but I have been using the oware cat tarp for a while without problems. Anyway, when, I dont have any fear of rain, I usually do not set up my tarp, and just bivy it.
the thing about the Cat tarp I do not like, is that there is only one pitching option, but the only flat tarps I have, are poncho-tarps, and I dont want to take the extra weight of the hood when I am bringing seperate raingear. I think for any thru- hikes I do in the future, I may buy something like an integral designs flat sil-tarp, so I dont have to set up the A-frame for months on end, but for this trip, I think I will be glad to have the catenary cut, because I may have to break camp abovve tree-line.