c coupe vs clk and the coupe's longevity. your comments?

Hi All. I am new to this board.

i am in a market for luxury and sporty sedan/coupe. on a recent trip the auto show i could not help but notice the similarity between the clk 320 and the c-coupes. i am aware that the clk320 and c320 coupe share the same engine. but how far does it go? on glance it appeared as if the new clk is a c-coupe without the pillar but with a trunk. i could not compare the inside as they only had the amg clk which was locked.

which leads me to another point. the c-coupe is my front runner. i am going for a test drive this weekend. i do have a concern with its longevity. it has been on the market for only 2 years and the c230 is selling at $2K under invoice which i was told is unheard of in mb land. the c320 coupe was just unveiled and its already selling below the invoice, again, unheard of. so what do you guys think? is this just a great deal or a sign of bad things to come? obviously having the model discounted or pulled from US would be a huge blow to the resale value (not to mention self-esteem).

has anyone here ever traded in a mb to a mb dealer for a new mb? is it true that you get a very nice deal?

for all of you c-coupe owners, what are the must have options? sunroof or no sunroof? i have limited experience with a manual (friend's beater), would you rate the c-coupe manual as only for experienced drivers or is it ok for those with limited manual transmission experience? (obviously i am going to make sure i am competent before buying).

btw. the sport sedan looks much better than their stock counterparts. anyone here had a chance to check out the c230/c320 sport sedans?

-Frank