Trunking isn't new...digital would be new but with budgets what they are I don't see a lot of agencies upgrading anytime soon, absent some huge federal windfall. Unfortunatley I don't speak Uniden so my recommendation is limited to GRE/RS. A Pro 93 or 95 handheld or their equivalent desktop/mobil would do fine. You can probably find 93s cheap but you will probably run out of memory pretty quickly, and neither is re-bandable. You might check the Wiki here for analog trunking scanners that are re-bandable. I'd also check to see that they are supported by software that will allow downloads from the RRF database (again, the 93 and 95 and their sister scanners don't). You need trunking but you don't need digital for most of what you want.
The answer to Alabama RS's question is that there is very little digital in MA (Lexington is the only town that comes to mind) and not even all that much trunking outside the MA SP (but there are exceptions, and Cambridge is one of them).
EDIT: I've seen
Pro 160 scanners, which are Uniden for RS, on closeout at a few local stores for something around $150. These would be a good unit and the price isn't bad for a new scanner with guarantee.