I'm also looking for a 12C, but I'm willing to step up to a '15 650S if I can get a good deal. Let me know if you're thinking of selling your car! Looking for a well-spec'd, low miles car for 200k from a private seller.
OP you might get more bites if you actually posted your target price range. There was an orange 650 spider 13k miles on autotrader that listed and sold for less than 189k, not sure if you saw that one.