That is a great buy for that radio. It is spektrum compatible and is packaged for just that reason. You will also need the spek module, which is another $150 and comes with a receiver, or spend the extra $19 and get the pro version. You will also want the optional drop down wheel ($41) which allows you to adjust the wheel angle for great ergonomics.
Some of us have also replaced the foam on the wheel with this crimefighter tire http://www2.towerhobbies.com/cgi-bin...?&I=LXLPW6&P=7
. Glues right on like a regular tire on wheel.
If you keep your eyes peeled here in the for sale thread you can often find a complete spek set-up EX-10 for about $225.
BTW, it is a 9 model memory.