We love ADT and their interactive, remote solution, Pulse.
http://www.adtpulse.com/
Don't sign a contract if your system is complete and functional.
I always recommend Metro Alarm. I have had 6 system, home and business with them and they are great. They currently have The UPS Store as a customer.
As do I, just know that Metro is not in the monitoring business, and that is where most of your money goes.
Promote your business here - Businesses get highlighted throughout the site and you can add a deal.
REVO luggage $100
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We have an alarm system installed and are looking for suggestions to replace our existing service company. Thanks.