Anybody running one of those monitored alarm systems?

Any that you'd recommend over others?

Not sure which direction I am going on this. Would like to have a monitored one but we don't have a home phone and likely aren't getting one.

Then again, the main purpose for this would be to set off loud noises if someone tries to break in while we are home (or away, for that matter). The police/fire stuff is nice, but I'm really just looking for noise should Johny Methhead decide to come knocking.

Any experience yall have would be much appreciated. I hate calling in a salesdork because they are going to try to sell me the Fort Knox system instead of just educating me on the pros/cons of different systems.