0* Mtn Hardware Banshee SL here. Last couple years its been too warm, so 15 would probably be OK for you. Of the brands you mention I would stay away from the first and last and lean towards Marmot or NF. REI makes some pretty good house brand bags for the price as well.

Since its backpacking, size is important. Check out the marmot helium. 320 bucks abouts and packs down way small. 15 deg. Heck of a good deal there (800 fill!)

https://www.backcountry.com/marmot-...ZWVwaW5nIEJhZ3M6MToxMjpiY3NDYXQ3MTExMDA5

Last edited by wildcat33; 03/16/17.