Actually, I'll vote for a wireless, if you get a good one. Mine is an ITI RF18 and I have had it for three years with no problems. In an industrial environment, wireless is definitely a bad choice due to the filthy ambient RF environment of most industrial areas. Resi is a whole different ballgame. Hardwired is better if you can do it without fucking up your house, but wireless is very flexible. It's easy to install, and in an existing home that's usually an issue.
Whatever you do, DON'T let those alarm company assholes talk you into leasing the equipment. Those $99.00 deals you see advertised work like this:
The alarm company retains ownership of the equipment. In return for your $99.00, you get to sign a contract for 2-3 years monitoring at, let's say, $30 a month. You think, and the salesman implies, that that means you're going to pay $30 a month for 3 years. In fact, if you read the REALLY fine print, you'll see that the alarm company has the right to escalate your rate after a certain number of months, typically 12 or so. If you complain about it, the answer you'll get is that it costs more to maintain older equipment so in order to keep servicing you they have to increase your monthly fee. If you take exception to this, they can and sometimes will come and take out your system and sue you for the remaining balance of your contract. Naming no names, Alpha Delta Tango has an entire staff of bottomfeeder attorneys in Colorado that do nothing but fuck people on deals like this.
Did they fuck me? Nope...I used to work for them.
Caveat Emptor.
QS