What advice to first time TT buyers? Airstream 27 footer...

I won't disagree with the Airstream being very nice. I also can't disagree that it's not the only option and for the money and weight, you may find a better Floorplan much cheaper and lighter in a different brand.

No matter what, I'd stick with the 3/4 ton truck. It just gives you so many more options. Many people start with a particular trailer and find themselves upgrading or "sidegrading" in just a year or so.