Trek Madone 6.9 SSL w/Dura Ace - $8,714.99
Trek Madone 5.9 w/mix of Dura Ace, Ultegra - $3,989.99
No prices listed for frames.
Big differences between the two. The wheel set on the 6.9 is carbon and runs about $3,000, while the wheel set on the 5.9 can be had for about $600. Also the new 6 series Madones are made in the U.S. and use a different type of carbon for the frame-- OCLV Hex, while the 5 series is made in Taiwan.