Righto, after some research and pondering, I went with a corsair RM-550

Propaganda link:
http://www.corsair.com/en-au/rm-series-rm550-80-plus-gold-certified-power-supply

I ended up finding a better price closer to where I was staying than I was originally going to pay. Yay for me.

This PSU seemed to be a better unit than one of the other PSUs that I looked at. Research indicates that this unit comes out if the Chicony factory and I've heard good things about them.