Yea... you can't really compare a C-250 to a C63 AMG...
I mean the AMG is double the price of the 250. lol and performance is in an entirely different league.
Either way, the C-250 is still a nice car - don't expect anything out of this world, but as I said, its still a Mercedes.
And yes definitely go with the sport trim over the luxury trim... just looks much more aggressive with the emblem on the grill and the styling.