We usually enjoy test driving the various Mercedes-Benz cars we get in at CNET headquarters, but the 2010 C350 that recently arrived was the exception. Although the C-class can be a comfortable cruiser and highly competent in the corners, this one was minimally optioned, making us long for the smaller-engine C300 we had tested previously. Lacking a navigation system, the included iPod integration kit had a horrible interface. And without that Harmon Kardon audio upgrade, the sound quality was mediocre. Our car did sport good-looking AMG wheels, but we would much rather have had decent cabin tech.