Toughest challenge sometimes is visualizing how all this will go together. I debated between size and features. In the end, have been happy I went with the Uniden full size/featured unit.
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After installation, unit size never has really bothered me. Soon, I'll get around to installing a retracting holder for the microphone. Actually, especially on the first trip with it, the hardest thing was adjusting to the cable being there. I quickly forgot about it and, most of the time, I just have it draped over top of the unit more tightly than it is currently.
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With this current mount, I took the top of the unit, fastened the 'top' to the CB mount, then reassembled the CB to it after cables were attached to the rear. The bulk of the time was spent routing cables actually.
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The flex in the mount can get kind of springy on rough roads so, when the tops are on the tennis ball's there to dampen the behavior. Eventually I plan to install a front-to-back component of a sport cage and will have a more-solid mount at that time. For now, this arrangement works really well and I'm happy with it.
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The only real negative to this install, and probably almost all the other larger unit installs that angle down, is that it does impede view of the rear view mirror. Depending on my seating position and mirror position, I might lose about 1/4 of the mirror vertically. Works out to about half of what I'd lose if the rear window wiper motor box went full-width for instance.
Whatever you choose, have fun. A CB was my #1, maybe #2, mod to the Jeep and perhaps the most functional still.