For what its worth, I got 10% off my Roubaix - when I went to the store originally I was offered 10% value in accessories, then after going away to think about it (it's still a lot of money!) and coming back he offered me 10% discount - which I then spent on accessories anyway!!!

Edited to add - for me, the premium for the Roubaix comp was worth the extra ££ - drivetrain upgrade, including the brakes, nicer wheels, a few other bits and bobs, and of course a nice sparkly paint job...