Let me answer your question about buying grey set. I have bought a few grey items from OP; some in the thousand-dollars range. I have no issues with their in-store warranty so far. While the equipment is under warranty, they will gladly do a 1-to-1 replacement if it is unrepairable. Otherwise, they will ship FedEx to the respective service centre in Shanghai and it usually takes 2 to 3 weeks before you can have it.
My experience with OP has be very positive so far. In fact, I have recommended a few friends and students of mine to buy from them (non-commissioning of course). Their reactions have been positive also.
I Agree with you bro OP is one of the FEW trusted Camera shops here in Singapore.. for me CATHAY and OP (Recommended by our fellow Pentaxian NoMoney) dnt worry about buying Grey as long as its good quality it should be fine: