I can't wait to see the next thread about "What equipment do we need to load in our new TT?" ;-)
Seriously, it sounds like you are one the right track.
If I may add anything to this it is:
Use the KISS principal.
Find the trailer first, the then tow vehicle to ensure compatibility.
On the issue of accommodating the children and friends, My DW and I struggled with this Q probably the most since it has a huge influence on what TT to choose. At the end of the day we decided that we would get what we liked and make it work (tent) for the times we had tag alongs. Its is a separate camping journey for them and they enjoy their camping time away form the "adults". On the rare occasions of bad in climate weather they and their mattress pads fit on the floor just fine. It is camping after all, not the Hilton.
