thats right about low book ( dealer trade in is what I call low book) 7 K on the car and your right 100k is over the mark I would save my money and find one with a lot lowere mileage after all that is the point of buying a nice car is to keep yuour ee you for the jewels that come along there are tons of high mileaage cars they sit aroun and sit around. save your money here is the link to nada guide.have patience and keep looking.
http://www.nadaguides.com/Cars/2001/Mercedes-Benz/CLK-Class/Convertible-2D-CLK320/Values
Those cars are meant to last 100 lifetimes. Mercedes are damn near invincible. If it looks clean and runs great, then yes. 117,000 miles for a 2001 is pretty reasonable, especially if it was a daily driver. Just dont put any big rims on it.