I did the security system for a fence company, Premier Fence & Deck. They have been in business for a couple of years now so I'm sure they do good work, and they were all extremely nice people too. They give free estimates so there is no reason not to at least get an estimate from them.
Here is their website (http://www.yourpremierfence.com/newsite/ - broken link). (phone number is in the top left)
Tell them Kyle (from Guardian) recommended them!
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