200,000 is alot for 5 years.
I would say say about maybe 13-14K max. The physical condition of the car will change the price of the car alot. With that much milage, I would take it to a mechanic that you trust and have him evaluate the car, you can also get a certified car inspector to do it.
Depending on what trim level, GLE is the most expensive, then SE, then GXE. Though the SE is the sport edition, so that would be my choice.