I've had these protections before and IMO they are only worth it if you are going to keep the car for a lot of years.
They can be a pain if you damage your car as the panel beater has to order the protection and I've had to wait weeks for that.
Having said that though, it does make it easier to wash your car as you dont polish it.
We had a mob (Rembrandt's automotive paint restorers) talk about their product at a FPV club meeting last month. They sell a product called Glare polish. The good thing about them is that they are mobile so they can apply it anywhere.
I'm actually looking into this one as it costs around $500 to do the car. The phone number is 0414419891. Mine spends a lot of time outside so that's why I'm looking at protection polish again.
As for the alarm, have a look at http://www.sentryalarms.com.au/
It will tell you about the MK4 alarm. Personnally, I'd go to the MK3 (approx $900 fitted by Ford) as it has a lot more features.