Just about all top-end GMRS radios average 2 miles range. Some people get a bit more, out on a lake or in a large field for example. We have also found that people tend to misinterpret the range they get, so be wary of any claims of range over 4 miles.
We have a forum member and moderator, jwilkers, who does a very accurate and thorough job when he reviews radios. I recommend checking out some of his observations and comments:
We have found Midland radios to offer the best mix of durability and range. Most GMRS radios (though not all) are able to use headsets, and many have VOX.
From Midland, the GXT1000 has about the most range you are going to find in a GMRS radio, rechargeable battery packs, VOX, and even comes with headsets. They are also rather tough and water resistant. They are reliable all-puprose radios.
People tend to buy Motorola either for a specific feature, or the brand name. We have found that they are no better (and no worse) than any other manufacturer. They also seem to have a thing for camouflage. Anyway, the MR350R may also be worth looking at. It has rechargeable battery packs, VOX, and has a headset port.
If you want the best battery life in a consumer radio, then Cobra makes several model with Li-ion batteries. The radios are a bit non-traditional though and are not as tough as a Midland or Motorola. You might like the CXR925, it has great range, VOX, and can use headsets as well.
The very best radios, as noted by SkipSanders, are commercial grade radios from Icom or Kenwood such as the TK-3131.