Get a Wouxun. Best bang for your buck, around the $120 mark I think. Contact Capital Airsoft for details. Great guys to deal with.
www.AlbertaAirsoft.com
Basic radio package comes with:
-battery
-clip
-radio
-charger
The radios are easy to learn, and have many great functions. Capital can also get you high gain antennas, spare batteries, pouches, etc. We've bought near twenty of these radios now, and we swear by them.