It's pretty good, though it's obviously $150+ over budget. Are you trying to cut the price down to something more manageable?
Other thoughts-
The Corsair H60 is a fairly slim radiator/fan design. In a tight space it probably makes a lot of sense, but in the Prodigy case you have a load of room and choice of coolers. I think there are going to be better options.
The GTX760 isn't really comparable to the R9 290, it's kinda two levels below it in performance so it's an odd comparison to make. The R9 290 and GTX780 are much more closely linked in price and performance, so that would be a more sensible comparison. If you are looking to get the price down, then an R9 280X or GTX770 are a good middle ground.
Memory prices in Australia are awful, but you can cut down that price if you need to. There are similar kits for $100.
Don't use a WD Green drive as a primary storage device. It's a low power/efficiency drive. Get a Caviar Blue/Black or Seagate Barracuda if you actually want to install and run things from it.
Cooling - I'm not sure where you intend to put the 120mm fan, but (ignoring CPU cooler for a second) the best you can add is a 140mm fan at the rear exhaust, and a 140/200/230mm fan at the front. Fans in the roof won't do an awful lot.