Grab a cheap old 35MHz/40MHz transmitter off of eBay, such as:
http://cgi.ebay.co.uk/Futaba-Skysport-6 ... 415b546cb1
Then convert it to 2.4GHz using DIY kits. This allows you to use all the fancy features of a more expensive radio but means you don't have to fork out lots of money to be using 2.4GHz. The conversion process itself is very straightforward and involves drilling a couple of holes and soldering a few wires.
I've used the Corona modules, that Gary has linked to, in the past. But they've not been 100% reliable for me, and since I've used FrSky modules, I've not had any problems. Instant bind, programmable failsafes in the receiver, and nice and cheap
The FrSky DIY module:
http://www.giantcod.co.uk/frsky-24ghz-c ... 05206.html
And 4-channel, 7-channel and 8-channel receivers:
http://www.giantcod.co.uk/24ghz-frsky-r ... 04806.html
http://www.giantcod.co.uk/frsky-receive ... 05458.html
http://www.giantcod.co.uk/24ghz-frsky-r ... 05319.html
And, if you choose to opt for this method, a few posts from forums that go through the conversion process:
http://www.rcgroups.com/forums/showthre ... hlight=ff6
http://www.rcgroups.com/forums/showthread.php?t=878096
http://www.rcgroups.com/forums/showpost ... ostcount=8
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