Cheapest Build for 3x1080p Eyefinity $AU

Will be used as a gaming computer.
Components Required, CPU, MB, RAM, MONITORS, GFX CARDS, already have all the other parts.

Part must be from Australia.
Current Plan:
Asrock z77 Extreme 4 $180
Intel i5-3570k $250
2x Gigabyte 7950 WindForce OC $350 each
8GB Corsair Vengance 1600Mhz $60
3x 1080p IPS Slim Bezel Monitors"don't know what brand" $600
3 Monitor Stand Capable of PPP and LLL or Monitors that can rotate.
Total $1790 as a crossfire setup

Please let me know what to change if anything. Future plans are to buy knew graphics cards every year, and a new cpu and mb every 2 years. If AMD can handle Crossfire too, and is cheaper please recommend. The point is to get a system that will not bottleneck 2 cards for 2 years, 3 max. Basically The cpu must handle 2-3 more generations of crossfire. Regarding the cards, they only need to last a year, and be able to play high end games well at 3x1080p.

Thank you for you time.