I use Smith Thompson and have been very happy thus far. We don't have all the bells and whistles just monitored entry points and inside motion detectors along with the mobile app for arming and disarming and it's $25 per month. Not sure if they have the video monitoring capability if that's what you're looking for.
Since the others haven't said it, if you put someone down as a referral, I think we both get a free month. Since I'm not first, I'll give the others the opportunity to claim it, but if they're not interested, let me know and I'll share my info for you to submit if you go that route.