Saw a CLA 250 yesterday at the dealer when taking my wife's car in for repair. The car looks real good. That price you are quoting is base, you will be spending a few thousand more to get all the things to make it sportier and more convenient ( heated seats ).
The car will be extremely quiet on the inside.
The repair bills are more costly on the benz.
Wife has a 4matic and do not feel as connected to the road as I do in the FRS.
The FRS is quicker than the C250.
The insurance will be cheaper for the Benz by a couple of hundred bucks. The FRS definately is leading the comments from others deapartment about every second person to none.
As I was looking at the CLA I was thinking what a great winter beater this would make, as I park the FRS.
One final thought for you, I HAVE NOT DRIVEN THE BENZ SINCE GETTING THE FRS!!!!!!! Good luck with your decision.