I just picked up a new RK version from Pat's trains. Wonderful loco, great detail, even has the break-away chains. Cost was about 1/2 what the ebay ad is. However, if your set on the premier verision, there's another one for 750$ PS3 as well, like new, same model number 20-3484-1, listing is 254513821093.
BTW, I highly recommend Pat's, I only bought this 1 loco from him, but the communication and fast shipping was outstanding. Will definitely look to purchase more from him.
Cheers,
MR_P