@kwi_fozze: Yeah, I was told a new engine might be the way to go. Not too sure how much that would cost or where to get one from though.
@jambun: Yeah, the radiator was definitely burped properly, we spent the whole morning doing that yesterday. I'm in Christchurch, but wouldn't a Subaru specialist be expensive? Like I'm after crazy cheap, I really don't have the money for the $800 at Repco, let alone $1500 at a Suby specialist.
@joker: Yeah, as kwi_fozze said, the radiator blew (it was the plastic end cap, so just got a whole new radiator).
Basically I'm in the situation of a) I need to spend a minimum amount, and b) if it's gonna cost upwards of $800, I might as well borrow some money and buy a newer car, and sell this for parts/scrap.