The wind noise problem is pretty much a thing of the past -- but even if you get one that's got it, it's an easy fix (or so I hear -- no wind noise with mine).
The visibility's not bad for a 2-seater coupe, but it's taking some adjusting after driving a Jeep Wrangler with the top perpetually down. Still, the blind spots are relatively small. I've also got a Volvo C70 convertible here and the visibility in the Crossfire is definitely much better.
As far as headroom -- well, if you haven't taken a test drive yet, do it!