Acoustic glass breaks can be a little tricky. Kids toys, barking dogs, putting away the dishes, jingling keys, etc can sometimes set them off as will breaking a plate or glass . Don't go crazy and only use newer DSP based sensors.
Impact sensors, don't bother. You'll go into alarm every time there's thunder.
I also wouldn't bother with pressure mats. I would add some more motion detectors inside and a couple strategic ones outside.
If you go DSC, the 1864 isn't much more and you'll need to pay close attention to your power budget there's only 500mA for all your keypads, wireless receiver, glass breaks, motion sensors, evk-4, etc. You could end up needing an aux power supply.