Spoiler alert? It's all Mercedes for me xD
Realistic dream car: C216 CL-Coupe, C217 S-Coupe, don't really care what engine but if I could choose a 63 AMG.
Realistic first next car: W211 E-Class sedan, most likely 220 CDI, 270 CDI or 280 CDI. It has to be a facelift, so 2006-2009. Very picky on how it looks, though judging my recent scanning of the web I think I'd be going for Avantgarde versions because of the nice dark wood and sportier appearance.
Reason I'd go for an E-Class instead of my 4th car becoming a 4th C-Class is just that, I don't want to stick to C's forever. Plus that C-Class cars, except the 190 series and the current W205, have a very slanted design. The noses are quite low and short and the rear ends are high off the ground and extend up quite a lot. Don't care if it helps in economy or stability, I like the more horizontal and balanced shape of the more luxurious cars.