I have a pair of Uniden GMR635-2(22 Channels) series bought about 8 years ago. Still working today. Back then I bought it at Fry's Electronics ( large electronics chain store ) in San Jose when it was on sale at USD29.99.
http://www.uniden.com/products/productd ... t=GMR635-2Been using it with group travels up north to Malaysia when we travel in more than 1 vehicles as well as some vacations when we communicate in Huge Malls, Theme parks like disneyland, universal studios etc.... Claims to have a 6 mile range with 22 channels but then this is line of sight. So far only negative thing about it that is has to use x4 AAA batteries which means I need x8 to use in both sets. Battery life is decent when using rechargables ( 1000mAh ). About 4-5 hours.
Anyway the manufacturers posted range does not tell you the whole truth as they do not explain what their test conditions are. All these walkie talkie are pretty much on a narrow band width ie.. 462mhz band, what this translates to is that it's pretty much line of sight as at this frequency, the radio waves does not bend much. If you can see the person or a little further out of sight with some trees / objects like that in between you and the other person, you will be able to talk to them. . If you have hills, valleys, large tall buildings between you and the person you are trying to talk too, you will have problems hearing them.
IMHO when buying GMRS Walkie Talkies, it's not the wattage or range that is important, it's the feature set on each radio that should be the main draw to a particular radio.