Sleeping for Guests in Front Slide Units

We're looking to move up from our current tent camper (a Starcraft Constellation) to a TM.  We know we'd prefer one of the units which has a King Size Bed.  The front slide units are most attractive because of the extra living area they provide.  However, we still would prefer some capability to handle some guests.  Our kids are grown but still enjoy camping and will "show up" on trips for an evening or part of a weekend.  Knowing there will eventually be grandchildren as well, we're wondering how those of you who have the front slide units handle guests.  It's our understanding the couch makes up as a double bed to handle two people, while in the 3326 the dinette makes an additional single bed.  If we were to buy the 3126KB, we'd get the extra sleeping space, but lose the living area.  We're not sure what's the best trade off.  Any other options or ideas would help us in making a decision on which unit we'd try to purchase.  

BTW - The info on this site has been amazing!!! We've camped in Starcraft Pop-Ups for 20 years, and if there was a site like this for those units it would have been a lot easier to make some of the repairs we've done.  I know once we get our TM it will be a lot easier to deal with anything that comes along.

Thanks for being so passionate and helpful about your TM's -it's a great sales tool.