We use Motorola DTR 550 and 650 radios. The new model is the DTR 700. They are 900mhz UHF full digital radios that are secure due to having frequency hopping technology similar to military radios. Being digital, the transmissions are always crystal clear if the radios are in range of each other, no static ever. The radio will beep to let you know if you are not in range, otherwise perfectly clear transmissions every time. Battery is really great too.
People will say that these are UHF and won't work as well as VHF radios in the woods. I'm always surprised how well these work and the distances I have gotten with these radios in woody and hilly terrain.