Have you considered REI's Novara Commuter trunk? It has the added advantage of drop down bags and rain covers.
http://www.rei.com/product/764699
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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