The Delaware County system really gives the scanners I have tried a hard time. Due to the simulcasting I usually don't get much more than gobbly-gook ("Medic 3 resp...BBRRRRRRTT...SSSHHHHHSHSHSHSHS...blip...brrp...EMS 1....blip"). What's weird is that this seems to happen in an awful lot of different places. I took a BC796 with me on a drive through Delaware county and the system sounded fine when I was north of Delaware on 42, but when I got into town it was breaking up horribly, and didn't get better at all as I continued south. The Pro-96 doesn't seem to do a whole lot better. I can understand having a few spots where the scanner gets screwed up, but it seems like it sounds bad more places than it sounds good.
I'm far from discouraging you from buying a digital scanner, just letting you know what you might be in for trying to listen to Delaware County. Other folks may have different experiences; if so I'd like to know what they're doing different
In any case the Pro-96 will work great on MARCS and any other digital systems that pop up.