I'd get the Benz. I don't know about you, but if I get a 328i I'll always be thinking of the 330i or the 335i. At least for the C, you don't care much for performance as much as the luxury, so a C300 would do just fine. It's not as if the C350 is that good an engine over the C300 anyway... But between a 328i and a 335i, there's a hell lot of a difference.