There are many options for radios out there, for trail mobile use my local club has somewhat standardized on Yaesu products. This helps with standardizing settings among those who have programmable radios, and also with troubleshooting help when on the trail, more people are likely to be able to help if you have problems with your radio because theirs is likely the same or similar rig. The FT-2800 and FT-7800 are very popular rigs. The FT-8800 as well.
This is true for the my area as well (Sierra Nevada region). On the Rubicon Yaesu radios prolly a 10:1 ratio against all others. They are rugged and their starter radios are a good value.
The FT-60R is the most popular HT on the trail out here and it is dual band. http://www.universal-radio.com/catalog/ht/0060.html Get a dual band magmount roof antenna and adapt it to the SMC antenna input on the HT (hand held) and you get pretty good range out of it's 5 watts and you can use it in multiple vehicles. You can add one of these amps for extra oomph. http://www.mirageamp.com/Product.php?productid=BD-35
But $150.00 will get you this bulletproof single band 2m mobile. http://www.universal-radio.com/catalog/fm_txvrs/2900.html
IMHO a hand held is the best starter radio. Inexpensive, nothing to install, charge it and use it inside your house (or in your car, motorcycle, bicycle, skateboard, etc...) as you have to be pretty rural to not have a repeater you can hit. (Unless you are in a deep valley).
And if you get a magmount antenna for it you can use that antenna with a mobile radio down the road.
Once you get used to Ham you will resent the space wasted to carrying a CB. Most of us still have to have CB because as CruiserDrew put it, the Luddites won't change. I refuse to mount a CB in my 70 so I bring a handheld CB when needed. But I do have a mounted CB in my Taco and it gets used a lot on the trail. But the Hams in my club do talk smack on 2m about CB when we are wheeling (on low power simplex of course).