Aurora trainer cord is here:
http://www3.towerhobbies.com/cgi-bin...LXZRJ1&P=7
JR trainer cord looks like this:
http://www.horizonhobby.com/products...r-spm-7JRPA130
So the aurora cord may work with a JR radio, or it may not.
If matching to an instructor is a key consideration then you better identify your instructor first. That could influence your choice of radio. I discuss this in the article on selecting your first radio.
As long as you don't plan to seriously get into full youse gliders the DX8 will be great!
If you do want to look at Futaba radios, take a look at these.
Futaba 8J - one of their newer radios.
http://www3.towerhobbies.com/cgi-bin...XBWGR&P=ML
Futaba 8FG - 14 channels.
if you want more than 8 channels or if you want to get into full house gliders
If I was upgrading from my Futaba 9C Super, this is the radio I would likely get
http://www3.towerhobbies.com/cgi-bin...XAVCN&P=ML
Or the newer Futaba 14 SGA, the other radio I would consider for myself.
http://www3.towerhobbies.com/cgi-bin...LXCVPZ&P=7