I agree with jdoc. $160 to $170k. $150k is unlikely as they are asking $199k. Not likely that they would go below wholesale from where they have started. If its an all option car, I would say anything upto $175k you are ok as prices still seem to be on the rise. I sold 4 GTs in the last week alone.
If you are looking for a steal, being as its red (dont shoot the messenger please) $155k would be more of a "steal" in todays market. $170k to $175k is fair asking price. $180k is TOO high. lost of red cars with lower miles available.