The CAAD9 5 has a Cannondale Slice Premium fork (second best fork Cannondale ever made IIRC?). It is carbon. I like it.
And you can pick one up for $1100 (or maybe even less if your LBS is friendly to you). I got one at that price at my LBS on Saturday.
The only difference is that it has the new 5700 105 and that the stem is C3 carbon instead of C2. The tires are also different, but I don't know if they are better.
I believe the Made in USA is worth it
