When we decided to move up from our 2551, we wanted exactly what we (and you) thought would be the best features of the 2910 and the 3100. There was a misunderstanding about what we wanted--the front of the 2910 and the twin beds and bath in the rear--- with the factory. Initially, we were told that it could be built that way but once Kermit (the owner of PC) finally understood what we wanted, he determined that what we wanted could not be built due to the length or some such thing. Our decision at that point was either the 3100 with the dinette or the 2910 with the twin beds or stay with the 2551.
Since we plan to do a lot of travelling next year and then maybe find a campground in New England where we can summer, we chose the 2910 because of the living area, the 2 large windows and the 2 Euro chairs. Had to compromise on that one.
I like the bath area better in the 3100 and also the hanging locker. I really wish that the other plan could have been built. Phoenix is very good with custom but if it can't be built, it can't be built!

Judi