Need to know what you want to listen to, i.e., public safety, aircraft, trunking systems, conventional, digital, analog, etc. Where are you located. Not trying to be contrary but you don't want to buy something you don't need or buy something that doesn't do WHAT you need.
Nashville Metro PD, FD and EMS as well as all the other city services are on a digital trunked system so your scanner will need to be digital capable. The choices are Radio Shack's Pro-96 and 2096 or Uniden's BC-296D, 796D, BCD-396T, and the older BC-250D or 785D if you can find them as well as their digital card. Sold seperately with the older models and they are also no longer manufactured. But some are out there, second hand. All models have a wide frequency range that should suit you. They are expensive (new) as compared to scanners in the past but to monitor Nashville Public safety you will need a digital scanner. Analog scanners won't work. In requards to the above mentioned scanners, the older 250D and 785D, if you can find one will pick up Nashville fine do to Metro being on a 3600 baud system. The newer ones, Uniden and Radio Shack, will handle both 3600 baud and pure Apco-25 9600 baud systems. They also will be easier to find and purchase. Hope this helped some. Good luck.