What is the best long range GMRS/FRS radio on the market? Thanks
Portable or mobile?
The comments above are right on. Anything you buy at a consumer store is going to be a poor choice for long range. The inefficient/non-removeable antennas mandated by the FCC for -any- radio that does FRS channels as well as GMRS is going to cripple your range.
You need to be looking at commercial radios that have the required FCC Part 95 certifications.
There you can run 50 watts from a mobile, and you'll find 4-5 watt portables. Best part is you can actually use efficient antennas, even gain antennas that will increase the Effective Radiated Power (ERP) or your system.
Icom and Kenwood are a few that you can find relatively cheap on the used market. Just make sure you consider the entire cost, including programming software and programming cables. If you are going with a mobile or a base, you'll need good quality coaxial cable and antennas, as well as power.