The Felt Z-series and Giant OCR's seem to be pretty close to Roubaix specs just doing a quick comparison of head tube/top tube lengths and head & seat angle for medium-sized (56-57cm) bikes.. But feel is everything, so you might try as many of the "relaxed geometry" bikes as you can, including the C-Dale Synapse and Trek Pilot lines. I narrowed it down to Roubaix vs. Synapse and bought the C-dale based on price, and have been very pleased.
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