Congratulations.

I only have HT's but want to add a mobile to the truck. I went with the HT's due to the volunteer groups I work with, but a mobile station has a ton of advantages. I have a 50w amp and antenna on the truck but still a mobile radio would be much better.

As to GMRS vs Ham...I think that is all dependent on your location and who is active or may be active in an emergency. I know my groups here have plans and contingencies for Ham bands but do not operate in GMRS frequencies. These are very local decisions so your best bet it working with your local RACES or ARES groups.

Have fun...it is a dying art.