One auction allowing users to bid on any of the coins (serial number of their choosing). That way you would cater to a larger audience and get all sold in one auction.
I like this idea. Or a model like Technomage's Denarium auction... highest bids gets first pick rather than bids tied to numbers.
I also think this is the way you are going to get the most
BTC out of this set right now. It does seem a shame to break up 10 consecutive low serials of the original Kialara. I'd hold them if I were you, but I will also bid on some of them if you don't