I'll second that, if after all the obvious things, earth cables are what I would be checking. I had mine go and originally thought it was a $300 starter motor. Was earth cables worth substantially less...
Just an update on this guys, today I had the chance to replace the fuel injectors and fuel pressure regulator with brand new items and also put in a new fuel filter and the starting problems are gone. Fires straight away now.
Cheers to everyone that helped