Hello!

"Customized cgminer 3.8" - oh, please use more fresh cgminer... It shouldn't be a big problem.

584.55 USD for 5.65 Th?! I'm in right now!!! But I am very afraid that your offer is just a scam. Usual artless scam. Hope I am wrong.  

How about cash-on-delivery (I very like that scheme...)?

p.s. also "Built in 2 x 750W power supply" probably is not a best solution - what will buyer do in case of PSU failure? Should he wait for arrival of spare PSU from your store?