Sorry I didn't see this thread for a few days, I have a 2 week old in the house now and neither she or the XYL are allowing me to play too much radio. (No Super Bowl monitoring for me this weekend either).
To answer some of the basic questions, FireCom does have plans to operate on the 500MHz system. In fact, they have been extremely active over the last two weeks. Fire Marshal talk group 4021 has been hopping with dispatches between FireCom and Fire Marshal, as well as FireCom and HazMat. See this thread:
http://forums.radioreference.com/ne...county-fire-marshal-testing-ncpd-p25-trs.html
Embedded in that thread is a link over to my site which has an image of the Nassau County Public Safety Fact Sheet as of 2009. In it, it states that the entire system is going to be encrypted. We know this to be false, because the control channels are not encrypted. Here is the link to the Fact sheet:
http://www.w2lie.net/apps/forum/forum_viewtopic.php?3890.30#post_4474 Maybe the just meant the Talk Groups would be encrypted. Learning from the past, I have heard multiple village police departments on the P25 system in the clear. Then, after some time, they turn on encryption.
Now, if you wanted to go digital, that is up to you. I have been slowly converting over to digital scanners, but I always buy the new toys. I am not your casual FD/PD scanner buff, but I try and monitor up and down the dial. To me, P25 is something I need, especially when it comes to monitoring some of the activity off the shores of LI. USCG uses P25 both encrypted and non encrypted. The NYC Metro-21 system is now P25, and renamed Metro-25. An anonymous donor gave me a list of p25 frequencies loaded into some FD radios. They have not been used as of yet, so I'm not added them into the RR Database until I can confirm use. Nassau Police also have access to the 400MHz UTAC Frequencies. They will probably be P25 if used, but can go back to analog as well.
If you wanted to see the current logs from the NCPD P25 system, I have about 28 pages of observations. The latest log is here:
http://www.w2lie.net/apps/forum/forum_viewtopic.php?3890.270#post_12704 From that list, you can see just how much of the Nassau County Public Safety P25 system is encrypted, and how much is in the clear. Anything I can confirm to be a positive ID, I enter nto the RR DB. If I am not sure of the use, I can't add it in.
Best of luck with whatever you purchase. At this point in the game, a BCT15X or BCD996XT will suit you just fine. IF you had the extra $$, go for the Digital. There isn't much here to listen to, but that doesn't mean there isn't anything to hear either.