We're in the midst of setting ourselves up for full-timing with our boys, 5 and 7 too!! I had the same complaint as you about the living room not having the room to LIVE in most 5th wheels. So, I found 2 that I fell in LOVE with. Here they are…
http://www.rvtrader.com/listing/2015-Coachmen-Rv-Chaparral-360IBL-112750738
The Coachman Chaparral 360 IBL is amazing because it has a decent sized bunk room (double beds!) with the bathroom in between it and the master (privacy!). And a huge living area. You probably need a big old dually to pull it.
The other one I loved is the…Cedar Creek Silverback 37BH.
http://www.rvtrader.com/listing/2015-Forest-River-Rv-Cedar-Creek-Silverback-37BH-112671343
I adore the massive sofa and the fact that the bunk room is HUGE (with a half bath!) so the kids can spread out a bit. Some come with a sofa/table instead of the bottom bunk on that slide side (nice for doing road-schooling?).
Even with as much as I loved these 2 models (I toured the Silverback…it's spectacular!), we ended up purchasing a new-to-us Tiffin Allegro 35 QBA. :)
When do you think you'll be hitting the road? Hope to see you out there!!