This should help you decide. I would go for the ASRock as it is a good quality motherboard and if you are going to get it off newegg you can get it 10% off. It is compatible with your system as it is an AM3+ chipset plus it is good motherboard to overclock on.
However the Gigabyte is also a very good board. but with the deal on a newegg you may as well get the ASRock.
my trouble is they wont ship to AUS from amazon, microcenter or newegg lol sounds like they are fairly similar is that the case? or should i definitley go with one of them ? i am going to run MSI GeForce gtx 770 gpu if that makes any difference...