You know you can't just bring the sound board straight into your camera, right? You need to step down the voltage with a resistance. Beachtek adapters and most mixers will handle that.
Look for a true diversity UHF system. Azden has budget-priced models and you'll get good deals on them through B&H.
I have experience with their VMx VHF series, 100 UHF and 500 UHF models. I've never had a dropout with the 500 set, but to be honest, dropouts and interference have been very rare on the 100 and fairly rare on the VHF set (but it does have a little background hiss), even in the "big cities" like Tulsa and OKC.