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Mine is a 2005 frameset, as per this:
http://web.archive.org/web/20070430102915/http://www.cannondale.com/bikes/05/ce/model-5RR9D.html
Ie a proper CAAD8, not a new 'riffed' one as Howard puts it!
Also if you click on the geometry link it states that the 54cm does indeed have a sloping tt.I reckon the red one is a 55 or 56cm. Odd number sizes were available as frame sets only back then.
As for my wheels, they are RR440s (asymmetric rear) on 7900 hubs and CX Ray spokes. Came in at just over 1500g i seem to remember. They ride beautifully, for medium spoke count hamdbuilts anyway. They'll never be like tubs to deep section wheels obviously, but they climb and sprint very well. Nothing bad to say tbh.
I'd wager the blue caad8 frame is more recent. It's the model they've riffed on the most, so it's to be expected that side by side with another 8 a couple of differences show up.