I am currently assembling my Nexstar 46 ARF, which is my first plane. Something I can suggest to you is going to Tower Hobbies' website and looking at the instruction manuals for the different planes you like-they all require different levels of assembly, even though they may all be considered ARF. The Nexstar, despite a few typographical errors in the manual, is very easy to assemble and requires minimal resources (materials, tools, glue, etc.) [actually Nexstar doesn't need ANY glue to assemble] while it still give you a good understanding of what's in a plane and how it all works. I just looked at the Avistar and Tower Trainer manual. These plane requires much more gluing, shaping, removing covering material, etc. If I had a lot of time and space to assemble a plane, I wouldn't mind getting something a little more in depth as it would be a great learning experience. However, I don't have time and only have a room to live in and build my plane, so the Nexstar is great. There are some imperfections with the Nexstar, but there are tons of resources out there so you can deal with them within an hour or too (since you've found this site, and I'd be happy to regurgitate everything I've learned).

The main reason I got the Nexstar is that in the manual there are directions on how to add servos and make adaptations for flaps; you can add up to 3 more servos and have elevons or full ailerons and flaps. It is my goal to utilize this opportunity to learn how to do all kinds of things on my first plane, then have more possibilities with second plane. And, since you have the radio you have, you would be utilize the computer aspect and mix channels together (once you've gotten the hang of flying without it) to link the ailerons/rudder/flaps and get a complete learning experience. You can probably do this with other planes, too, but the Nexstar comes pre-setup to make the changes really easy.