I'm looking at putting a digital scanner in my car for SHTF situations, for instance knowing what roads are blocked off and which aren't in case I need to bug out to the boonies.  Does anybody know if the GRE PSR-600 Scanner is any account?  

I'd like something that can pick up 'trunked radio' channels and that sort of thing since all the agencies, LEO and otherwise in my area have moved from analog to digital communications.  Any recommendations for a scanner under $200 that can be mounted on a dashboard would be welcome.

you need to read this thread first:
http://www.ar15.com/forums/topic.html?b=10&f=22&t=626929

then come back here and tell us what type(s) of systems your local public safety folks use.  only then can folks help you select a scanner.  this is a cart vs horse deal, and you can't get it backwards.

ar-jedi

My apologies, thanks for the guidance as I only skimmed over that thread.

I started this one a few weeks ago and it is all about mobile scanners - good info.

http://www.ar15.com/forums/topic.html?b=10&f=22&t=627369