If you want an all inclusive setup, you need zwave compatibility. X10 is history and extremely buggy unless you get control units that send back acknowledgements and even then, I don't trust it.
You will also want a main panel that can support video feeds so that surveillance and alarm conditions can be handled through one interface.
The main weakness of any alarm is the phone line. It is trivially simple for someone to cut you phone and cable. So most decent alarm systems come with cell phone uplinks. You just need to provide the sim card.
You'll also want at least one external siren as a fallback.
You can do all of this with wireless components although some things like the siren will need a wired power source. Virtually everything else can be battery operated. Most sensors run off of 9v but small ones will use CR2032 or 2025 batteries. Get lithium 9v for the sensors that use them and you can go years w/o battery changes. But any decent panel will show you an alert when the batteries fall below an operational voltage.
