I was in a similar as you - we knew exactly what trailer we wanted (and it's 6500lbs dry) and I had originally looked at getting a Suburban. Being a newbie I initially looked at 1500's until I realized there was no safe way to do that. I then looked at the 2500s and since I have my wife, 3 teenagers and my 2 German Shepherds I decided on a Ford Excursion.
It's massive but it tows my trailer great. I like being able to travel and know that I'm not over or near the capacity of my rig The only thing I did was add airbags in the rear to level the vehicle out when towing. I was fortunate enough to find one that had 45k original miles in like-new condition.