I moved to Montana last year with the intentions of buying a boat. Eventually my girlfriend and I decided on getting a raft is it would be more versatile then a drift boat. We looked at NRS, Maravia, RMR, Hyde, AIRE, and finally Sotar.
If your on a budget, I would highly recommend AIRE. They have the best warrenty in the business, no questions asked. RMR is a fairly new company, They are very durable and have a lot of good reviews already. I don't know to much about NRS, but I thought there were better options when looking at the higher end models (Otter/E-series). Saw a lot of them in Colorado...
If money isn't an issue. I would reccomend Maravia or Sotar.
Maravia uses a PVC base fabric and encapsulated in polyurethane. Super durable, probably one of the most durable boats on the market. Drop stitch floors, great if you plan on casting while standing. Only down side with Maravia is they don't track well. Sotar is the oldest Raft company, great reputation. Boats are highly customizable, durable and are made with Urethane.
I looked at the Sotar Strike. The Strike was designed by a Montana fly fishing guide, for Montana water. It has 2 chambers and has fairly little rocker. My only concern was it being a little on the smaller side, especially width wise. I wanted extra chambers incase anything went wrong on an extended trip.
After more research, I found a Sotar design by Montana Raft Frames. It's pretty much a beefier Sotar Strike. It has extra chambers, more rocker, bigger diminished tubes, and more width. I thought it was the perfect combination of features. I really like the rod dog holder, which carries two rods. The seats are extremely comfortable and are elevated slightly, which makes it super easy to fish while sitting. The anchor rope runs through the frame, which I thought was pretty cool as it reduces clutter. The boat and frame run about 9k. Plus another 2.5k for a trailer.
The pictures below are from Montana Raft Frames website and show the boat and frame. The bottom picture is the exact color scheme and set up that I have.