I have been very happy with the functionality of my Uniden Pro520XL. Very inexpensive, and I like that it has both rf gain and squelch as I can adjust out noise.
However, all CBs only legally output 4watts. So most are going to be pretty similar. I can hear and talk effectively for two miles in the mountains here in New England. The main thing you want to focus on is your setup. Quality antenna, quality coax (rg8x imo), proper grounding, and tune your SWR. You could buy the top of the line CB and it won't be worth a damn if you don't set it up right.
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