You might want to also check out the Trek Gary Fisher Lane cross bike. I recently picked one up at a steeply discounted price (I understand they will be dropped from the line this year), and use it as my daily commuter. Even without discount it would come in well within your price range. Because of the slightly more upright position, I've recentlyoutfitted mine with the Selle Anatomica saddle (not yet installed on the photo posted, but with over 600 miles on it I'm quite happy.)
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A conclusion is the place where you got tired of thinking. - S. Wright
Favorite rides in the stable: Indy Fab CJ Ti - Colnago MXL - S-Works Roubaix - Habanero Team Issue - Jamis Eclipse carbon/831