Two and a half years ago we had a 2008 3400RL that we had purchased new and was a lot like your present High Country except for the bath. Was at our dealer one day and decided to "kick a few tires" to see what had changed in 4 years. Walked into a new 2011 3585SA and that was that! That was without a doubt the floorplan for us. The kitchen is large with a lot of counter space. No problem for 2 people at the same time. We also like coming in the door into the LR which is also very spacious and open.
We did not buy the 2011, but did go ahead and order a 2012 since they were already out and the 2012's had the new arched ceiling from front to rear and the auto leveling system was just added as a separate option. I also believe that 2012 was the first year that the BR slide extended an extra 6" or so giving more room at the foot of the bed.
We have been fulltiming almost 4 years and love our 3585SA. Too bad Montana discontinued it after the 2012 year. Glad we got ours when we did!
2018.5 Montana 3791RD
Full Timers 9/1/2010 through 1/16/2020.