Hoosier Welcome
First you need to decide how you plan to use it. Will you move every couple of days or will you sit for a week or so before you move on? If you move often a Class B or a small C might better suit you.
Airsteams are expensive. Well respected. but expensive. $43,000 MSRP new 2014 16' trailer and $32,000 for a used 2010 is high. You can buy a tricked out Scamp of the same size for under $20,000 and it's a 1,000 pounds lighter. Seriously you can find a nice 36' 5th wheel for $43,000.
Easy to tow is a relative idea. Easy to you and easy to me are probably two different ideas. With the right tow vehicle and a little practice easy become a very vague term. As Birdbybird stated pretend to live in the camper. Stand in the shower, sit in the chairs and lay in the bed. Pretend making the bed some are really a pain in the tush to make. Can you reach in cabinets? Do your pockets catch on things? Are outlets where you need them? Where will you put the coffee maker, your clothes, pans etc.....
Go walk through trailers and figure out what you need and don't need. Look at how you live and if the camper supports how you live. Don't get caught up with the flash and take your time. No RV is perfect but you can get pretty close if you take your time and do your homework.
If you buy a trailer make sure you can pull it. If you need a new tow vehicle to pull It, a Class B or C might be a better choice. A get to gather is an opportunity to see how other use their RV's and give you ideas.