I'll see if I can answer your questions:

Radio- If you want a Futaba radio, I would get a 6EXA computer radio. It is only a little more than a basic Futaba 4 channel. I see no point at all in getting a 6 channel non-computer radio. If you need 6 channels (flaps, retracts) you would want a computer radio. Computer radios have a lot of nice features, even for beginners. The ones you will use most often IMHO are: servo reversing, multiple model memory, exponential or dual rates, and end point adjustment (adjusting your servo throws electronically). As someone pointed out, however, you won't be able to use these features (except reversing) with a buddy box, unless the buddy box is also a computer transmitter set to the same settings.

Durability- Any balsa trainer will take a fair amount of abuse. Mine has survived rough landings, punctures in the covering (patch with packing tape) and a low-level stall and resulting crash. If you nose in from high altitude, any plane will be pretty much toast, including some of those advertised as "indestructible". You've got a good combo in mind.

Make sure you get an instructor and do not try to learn on you own. I did and regretted it. Have fun!

-Scott