That's pretty cheap if it's genuine & includes everything he mentions. I would be tempted to buy it! If you're interested check out the part no's with the seller.
As I am finding out the grilles alone are expensive!
Off course you can - Sports Edition (which includes AMG body kit as part of the package) is available for CDIs from the factory and I have seen a face lift C200 CDI with AMG body kit package that was factory ordered and it looked good, and had the standard down pipe back box for the exhuast.