Beats me! The only thing is if you badly want DCT you need a 2009+ model but those can be found for mid to high twenties.
2008 models have the DCT gearbox and you can pick them up for low 20's now.
A well specced 2008 DCT coupe would be my choice if I were buying another. It's easy to upgrade to CIC and that is really the only major difference in the later models. Oh and some LED lights if you're really that bothered.