You don't buy close to christmas you buy after at the end of January begining of Feb before the weather brakes, the credit card bill is in and eveybody is sick of being wet and cold.
Bad news is that age of bike will most likely be above average mileage or a track addict. Nature of the beast. They are not loved, more whipped like a racehorse.
You hope is a loved example that has been treated gently, trouble is that may cause greif because its never stretched its legs.
If its not going to be main transport, as R6's rarely are.........
Why not look to something with a bit more. How about a TZR250, 130mph and with minor tweaks handling that will embarass most normal R6's especially tired 10year old ones, none of the "couldn't afford an R1 then crap" add looks and cudos in spades (so long as its white and red) AND for 3.5k you can get a proper tiny milage minter and change for track days/leathers etc.