I have used the Pop Ups (28 and 38) as well as the Sawtooth (and really like the new Pop Ups for day hunts with minimal gear, but still be able to pack out with the Overload shelf.)
I like the option to bring more gear if needed, especially late season hunts with more layers, etc. so I would steer you to the Sawtooth. It is on the GuideLight MT frame, has the sweet waistbelt and Overload shelf, and if you want a bigger pack option you can pick up the Beartooth 80 as a bag only, thereby giving you two packs on one frame that is sized and dialed for you; just swap out bags and you go from 45 liters to over 80 for longer hunts.