If you're thinking of playing with the Ciseco RFu radios I would recommend getting one of these from them at the same time.
Having painted myself into a corner by uploading an stupid sketch that saturates the radio, it was just a case of changing a couple of jumpers, popping the RFu into the socket inside and reprogramming it.
It's only a couple of quid more than their straight USB stick radios but you get yourself a more versatile device. This is doubly so if like me you don't already have a USB FTDI interface.
While the lid's open I may fit an external whip antenna, it seems rude not to.