Unlikely to gety a discount on the insurance cost on a car like a orion due to age/value/likelyness to get nicked.
There is nothing hard about installing the alarms, I just bought direct from Toad a C4 unit, as someone had a C5T2, which uses the C4 unit that had gone wrong, so they sold me a C4 alarm instead of having to buy the whole lot.
Toad did NOT want to know about the damage caused by the back up battery leaking all over the pcb when it was tired and shagged out, it was a NICD pack.
Be aware if you want arm/disarm beeps that you will need to know the switch sequence which you do NOT get with the alarm.
Furthermore the alarm will be silent arm/disarm, as it is actually illegal now to have a beep on new fitted systems, due to noise position.
The switch setting done by the 4 pin code number(counting led flashes) then pressing button 1 or 2 as needed is easy but cock it up, and you can mess other settings.
If you want a copy of the switch sequence just pm me.
As you most likely won't get a discount there are other systems as good as toad but cheaper, like Scorpion(who own TOAD), sigma etc(also owned by scorpion).
The sterling and A101 are certainly excellent systems, my all time fave was the ai600.
tabetha