I just purchased the "Cannondale Cyclocross 800" about 2 weeks ago, and love it. It has the same Optimo SI frame as the disc version, minus the disc of course. You will also have the upgraded components. I rode both at the time, and could not tell the difference, so I went with the non-disc version, since I would be on the road 98% of the time, and less $$. The Cannondale Cyclocrosses also have a much stronger frame than their roadsters, which makes sense since it is used for other field purposes. I weighed it the other day and it came in at not quite 21 lbs.--a big difference considering my other is a range bike at 42 lbs. If you make use of this time, you can probably pick one up on sale since the season is over, and people are getting ready for road season. I paid $850 for mine, the disc version was $1400 at the time.... Road 30 miles yesterday with a friend who has a nice liteweight Bianchi, and had no problem keeping pace either. But then, we're not too serious--just intense workouts of any sort.
P.S.: when fitted for the bike, make sure that the handlebar width is proportioned to you shoulder width. Sometimes they will throw on a narrow set.