Guess there is not much input for this one... is there another category or online forum that should/could be used ?
Basically just trying to get a rec for the best place/s to shop online for such a sytem.

Try the forums at the homesecuritystore.com for alarm advice. A few things to think about...
1. Exterior motion -- Do you really want a phone call each time a deer passes by outside your house? Outside motion detectors will likely be a false alarm problem.
2. Most alarm systems won't call cell phones.Even if you could get the alarm system to call your phone, then what would you do? Consider an alarm service. There are DIY alarm companies that aren't that expensive.
3. Wireless can mean several things -- you can use wireless to hook up your sensors or you can use wireless to connect to the alarm panel to the phone network.

Here is a link that might be useful: homesecuritystore.com