I'll start by saying I don't like to be sold a kit. For example, my Uponor underfloor heating was mainly sourced from Ebay. I did my research and bought most of it (new) at a fraction of the price of the 'kits'.
The stuff is not expensive, just heavily marked up usually.
So, with that in mind, I want to buy the components when they come up cheaply. I have 8 core wire to each window and door, so just need to buy the sensors etc. I want a control panel and separate keypad unit. I want that to be good looking.
I would like the opportunity to add ip cameras and notification of a trigger event via an iphone app. It has to be all configurable without a science degree. I am competent DIY, but have no actual experience in alarms.
I don't have the cash to spend now, so don't want to buy it all at full MSRP. But will be willing to add stuff as I can afford/find. So the system needs to be something that is likely to be current for some time.
All a tall order I know. The more research I do, the more I end up doing nothing!