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I like your suggestions, however it appears to be a discontinued radio, and was superseded by the 2730a, which is also a dual band with a detachable face but no cross band repeat.Icom IC-2720H seems like it would work well for you. You seem to have liked the icom interface better than the yaesu--I also think the icoms are more user friendly. The 2720h has a removable/remote mountable faceplate, supports aprs and can cross band repeat. So what? Well, that gives you access to your truck radio's power and antenna from an HT when you are out hiking. Also, your v8000 was a 75w radio, that may have affected your impression of the 50w 7900. For antennas, a nmo mount on your roof is an excellent choice. A dual band comet antenna would get the job done just fine. Take a look at the sbb and csb lines of dual banders and choose the length you want. The major difference between them is that the csb line is stiffer and has a foldover hinge while the sbb series is more flexible.
I think the antenna mount on the roof was a big factor in making my old icom v8000 tx/rx better than my yaesu with the antenna on the hatch. Which is why I plan to do all I can to center mount it on the roof.