Re: No masterkey or Codecard
My youngest son did exactly the same thing, same car, same year. He only got one key with it.I got a locksmith in to copy the key and he was quite confident in saying that such things are not the problem they used to be. He basically said if you have the key it is usually possible to sort the car.
On the basis of "if its not broke don't fix it", I wouldn't have a new system fitted, you are talking 4 figures for the proper Alfa system. Theres lots of stuff about keys and alarms in past threads on here, just bear in mind that technology marches on and some of the info may be dated now.
Enjoy your car, look after it and worry about it if or when it packs up,its the only way to be with an Alfa.