You might want to look up wlaurent here on the board.
He is had a great deal on an alarm system for our S2000's!

 

THOR 2-WAY LCD CAR ALARM SYSTEM w/2 TRSMTRS !

SYSTEM FEATURES:

1. Two Transmitters (As Pictured)
2. Valet Unit
3. All The Batteries are Included
4. Newest and Very Compact Cell Phone Design for your
Transmitters
5. Up to 3000 feet of Communication Range
6. System - Status Check and Engine Immobilizer
7. Real - Time Clock
8. Personal Alarm Call
9. Vibration of Remote Control
10. Remote Engine Start
11. Trunk Release
12. Six (6) Months Manufacturer Warranty

This is just my Two Cents Worth.... check Ebay and local dealers. I purchased two systems.

 

Well, for anyone interested I got my car back and I now have a CompuStar SS security system installed in my S. The install only took a day. At first glance, they seemed to have done a good job. Nice clean installation. Now I get to play with the system and try and figure out how the 2-way transmitters work. No complaints about Car Trendz which is where I had it installed.

 

I installed the hornet OEM add on alarm so that I could use my factory transmitters. I also installed the microwave sensor add-on in case the top was down. It works great, except for the "warm-away" going off when it rains hard (as mentioned above on the Viper system). I see you're in fairfax. PM me if you decide to get this alarm and need some help. good luck!

 

I got the Clifford RS3 on my S and its awsome it has the pager and I got it at BestBuy and they also installed it too.....