I traded-in my `03 SC430 for an `05 645Ci on July 15th. The funny thing was that I wasn't in the market for a car. I was curious to see the 6-Series convertible up close and there was a BMW dealership next door to the Best Buy where I had gone to purchase a couple of power strips. A test drive was all it took. The 645Ci is an awesomely powerful car. Other than lacking power, I had no complaints regarding the SC430; however, it is no match for the 645Ci.