I am currently planning on purchasing a new car and the 2012 C300 is on the list to consider, Anyone have any comments good/bad? In addition, I would be considering have an ECU upgrade and wondering which brand would be the most desirable and affordable. Any other possible upgrades to consider as well. I know the C350 would offer a lot more power, but those aren't available for a few more months from what I am told.

Thanks!