DSD is a nice solution, but I prefer to just pack around a single portable radio. I bought an Icom IC-F3161DT, and have loaded it up with ham, plus receive-only for everything I want to be able to scan.
Mine has the RR (railroad) firmware, which allows direct-entry of the AAR channels, whether wide-band, narrow-band, or NXDN, The AAR channels do not take up any of the 512 memory channels. However, if you want to "scan", you WOULD have to program them into your memory channels and set up a scan bank. If you don't get one with the RR firmware, no big deal.
Or you could get an IC-F3161DS, which is the limited-keypad version, and not available with RR firmware.
D=digital module installed - required for NXDN
S=limited keypad
T=full keypad
Can be found for under US$200 to over $400 on eBay, generally in mint condition. Just make sure it doesn't have a programming password installed, because you can't get around it. And it's cheaper to buy a D radio rather than a non-D and try to add the digital module later.
I recommend getting a genuine Icom full-size antenna, not the compact antenna, and not the Chinese copy.
Kenwood makes NXDN radios as well, but I don't know anything about them.