I have mining rigs for sale with the following hardware (11 rigs):

Motherboard: ASRock 990FX Extreme3 Motherboard (supports up to 5 GPUs)
Case: Aluminimum Lian-Li Case
CPU: AMD Sempron 2.8Ghz or AMD FX
RAM: 4GB RAM
PSU's: OCZ Gold 1250W or OCZ 1200w Platinum
GPU's: 3 x Radeon R9 290
Fans: 3 x 120mm industrial fans
HDD: Comes with OS and drivers pre-installed. Includes cgminer pre-installed , and is setup to start mining immediately upon start up.  These are about as plug and play as you'll get, just update the mining config file with your pool and you are good to go!

Price: $1600


For the (33 in total) R9 290s (reference cards, ranging in different brands: XFX, Gigabyte, ASUS, Sapphire) on their own: $420 each

Shipping to be calculated from Sydney Australia on request.

Happy to use Escrow to make this transaction secure.