Dont get the DX3E it is honestly garbage for your money... Superior radios that have screens to easily adjust anything you want and you can see it for the same price and quite a few that are less...
Here is a few examples.
http://www.amainhobbies.com/product_...annel-Receiver

http://www.amainhobbies.com/product_...-Surface-Radio

http://www.amainhobbies.com/product_...io-w-Telemetry

There is quite a few more out there as well for $100 or a slight amount more.

If you want to save some money and arnt doing a lot of really serious racing these work just fine as well and are really cheap!

http://www.hobbypartz.com/79p-gt3b-carradio-lcd.html