If you think the possibility exists where you might want to spike out a few nights, going larger and cinching down for day use, as others have mentioned, would be the way to go.... especially if you only want one pack. A MR Metcalf would be a good option, without being too large.
If you strictly want a dedicated daypack, without the need to overnight, I would look at a MR Pop Up 28. It's slim profile almost hides behind your torso, preventing it from getting hung up in heavy cover. Its also a great size to carry just what you need for the day, and nothing more. I have a Sawtooth besides the PU 28, and when I use it as a daypack, I find myself overfilling it with crap I don't need for a day hike/hunt.
As far as conventional bag vs quilt, I have no opinion. I have no experience with a quilt.