VX-3200's do narrow band well.
Where I used to work, we had hundreds of Vertex VX-3200's, they all worked well in narrow-band. I have two Vertex VX-3200's, one UHF and one VHF that have been running in narrow-band mode for several years in my car. They will be there until they literally break or the car gets totaled. They do very well. As for scanning, that has been something that has never worked for me.
Several procedures have been tried, a button has been programmed for scan, channels added to a scan list, and it has still never worked. I found that using the up and down buttons and making my banks of channels smaller works for me though.
As a previous poster said, cables are easy to get online or through Vertex. Software as well.
Some models I have had trouble with in narrow-band are the VX-2200 and VX-4200 radios. This is due to faulty filters being installed at the factory. Vertex had a technical service bulletin for this out a while back. But the VX-3200's did not have that problem.
So if you already have the 3200's, just know that they are very reliable radios, even in narrow-band. Since they are discontinued, (and no longer repaired by Vertex) they are getting cheaper on the used market.