The Gossamer Gear Mariposa is one of the packs of interest, but I don't see it in the local stores. If you ordered it directly from the manufacturer, how was your interaction with them, and do you think that they will work with a customer to get the right fit (that is, prompt no-fuss exchange of sizes, or just plain refund if it doesn't fit well at any size)? This pack got a very nice review at Section Hiker website, along with several others. Granite Gear looks interesting due to the extreme adjustability, with different shaped and sized shoulder straps, different shaped and sized belts, a framesheet system with different width attachments for shoulder straps and different height torso adjustment at 1" intervals. Well, I will be off to REI and see if anything in the store at the moment happens to fit me well, have main compartment panel access, and have lashing points for attaching a tripod. I could get lucky.
I haven't dealt with Gossamer Gear but their packs are probably what I would get if I went ultralite on packs. I have purchased an ultralite sleeping bag and duplex tent from Joe Valesko of zpacks.com. He was very easy to deal with and while I loved and kept the bag, I returned the tent after deciding I didn't want to move away from my current favorite Big Agnes Copper Spur UL1. It took a little while but I got a full refund from Joe on the tent without any hassle.