There are a few other posts mentioning the Granite Gear Crown. I recently bought one and, much like yourself, I searched high and low before I made a purchase. For me the cottage brand packs were out since I could not try one on. They may be most excellent but there are excellent shoes that don't fit my feet!
Anyways, I did look at the Osprey packs and I decided against any of their packs because they have tons of features. Lots of straps, buckles, pockets, etc. The Granite Gear pack is much more simple, cheaper and is pretty large for the weight. The general feel of the pack was something that will have a good balance between weight/durability/comfort with the loads (15-30lb) I plan on carrying.