I wouldn't really trust a security system considering how lazy the cops are in my area and the cost... We are getting a german shepard though, always wanted a dog, even if it can rip my face off.
A security system is just discouragement. That's all any of this advice is. You're discouraging people from robbing your house as it's high risk compared to the return. As is the dog. You might also like to get a fairly loud dog, so that people know it's there. Oh, and a sign saying, "WARNING DOG". Locks don't discourage, they just slow people down. I could break into almost any house given a hammer.
If you're EXCEPTIONALLY paranoid, and have a back garden wall, you might like to consider some of those greases that absolutely stink, or some barbed wire / shards of glass, and just put them at the top of the wall. They also discourage pigeons and kids from trying to climb over.
it will be a while (a week +) before we get the insurance money and even longer (2 weeks +) before i recieve a new computer, any ideas on securing items before hand?
Just use public library computers or whatever. You're on a friend's / family member's? I don't see a real problem with that. If you want games at the moment, I'd suggest grabbing them off eBay or playing free ones. If they stole a bunch of cash, it'd allow you to make some back.
Like I said, a gun that you regularly "practice" with (it can just be an air rifle / pistol out in your back garden) will discourage any thieves that stake out houses.