would like some opinions and suggestions on the best in car and best portable or handheld scanner?
Be aware the many public service agencies have trunked, digital and encrypted systems now and the setup is somewhat more difficult than just turning the scanner on.
I am not current on stand-alone scanner technology, so this might be easier than I think. The last scanner I set up required that the eleven frequencies for our trunked county network be entered in a specific order. They are now encrypting a lot of the transmissions. Each additional trunked station had to have its set of frequencies determined and entered. You also had to follow different procedures for different manufactures of the trunked systems.
Many of the smaller communities are still on the VHF/UHF un-trunked systems. Texas DPS is also on the older transmitters but they are being encrypted so that all you get is an annoying buzz when they transmit.
As far as a recommendation on a mobile amateur radio, we have a large hospital network and have chosen the Yaesu FT-8800 as the mobile/base radio of choice. It can scan the public service frequencies in the VHF/UHF part of the spectrum.
DO NOT waste your money on ICOM's DSTAR radios unless you just want to play with the latest technology fad. You double the cost of the radios and the infrastructure is not there, especially in the rural areas.
Several of the local hams that jumped on the DSTAR bandwagon have their radios for sale.
If you are heavy into to APRS, as I am, then the Kenwood D710 is a consideration. I prefer to have a separate single band 2-meter radio for my APRS trackers but my Tahoe did not have a place I could locate the second radio and TNC (after I had added my RAM desk, CB, 3 GPS units, video streaming camera, Air Card (with external antenna) and 12V distribution panel, so I went with the D710 with its built in APRS capabilities.
In my older Chevy pickup, I have lots of room and have separate radios for each function.
BTW, I have CB radios with NOAA WX functions in all of my installations. These radios have probably kept us out of trouble more than any of the other stuff. Good ones can be had for less than $70.00. (Check the big truck stops for CB stuff.)
If you care to read a little more about my installations, check the current Converter/Inverter thread going on in this section.