To all who've replied, thank you for the information.
I do have the Revell(?) Caprice (early '90's version) and an Impala. I've seen the Crown Vics, but they seem to be few and far between. I never really contemplated die cast, that opens up yet another door!
Agentg, with what department do/did you work? I just got hired with the Connell, WA, PD. "My" car is an '01 Crown Vic with the Vector light bar. Since it's my first patrol car, I kind of wanted to model it! Yeah, it's one of the oldest we have, but we're supposed to get a couple of new cars this spring and I should get one!
Again, thanks for all the information. I knew I could count on you!