I currently just have an HT mounted semi-permanently in the rig and attached to a remote dual band antenna mounted on my front bumper. I will be upgrading to a legit mobile unit in the near future, it just always gets bumped back down the priority, as most of my radio usage is HF (I use an Elecraft KX2, for the curious). When I do upgrade, I've narrowed it down to either the
Yaesu FTM-400XDR, or the
Kenwood TM-D710GA, with the Kenwood taking the top spot in my current thinking. They are both fantastic dual band radios, and meet all of my needs:
1) dual band
2) cross band repeat
3) APRS w/ built in GPS
4) 50W
Kenwood eeks ahead for me because of a couple more features that i would use:
Dual receive on same band (i don't think the Yaesu can do this)
Much better interface to connect to a PC
but the Yaesu also has a killer APRS grouping feature - lets you group call signs in your party, so you can see at a glance where they are, in addition to being able to send messages and have them broadcast to the group.
gah, it's such a difficult decision for me, and this is a big reason why i've been paralyzed into not buying one yet
as for your mounting questions:
I plan on mounting the "base" under my drivers seat or possibly under the dash, and then mounting the head unit on my dash or up near the rear view mirror.
Antennas: As i said, i have one dual band antenna mounted on the driver corner of my front bumper, I also have a dual band mag-mount in the center of my hood (which i currently use as a separate APRS antenna), I also have an NMO mount up on my rack, I used to have a foldable dual band antenna mounted up there but have since removed it since it wasn't regularly hooked up to a radio. when you add in the CB antenna and the FM antenna, my rig is a bit of a porcupine.