I've got a Vertex VHF radio. Very very handy and I got it for the same reason you mentioned ie keeping in touch with party members or with SAR if all goes wrong. Esp if you get a whip antennae you can hit repeaters. Even with line of sight reception/transmission is v good. Basic politeness if to ask permission to get the correct codes for the repeaters - eg in the Bugs you would call CMH Bugaboos and ask for permission and don't always expect it to get granted.
Here's a good place to get them http://www.mparam.com. He can do modifications for you and he can set you up with what you need.
I got the Vertex VX - 170 btw - very tough. Its taken falls, dropped on snow and ice, basically beaten the crap out of it and it still works great.