Step is very nice in the 335, DCT is even better, but if your price range will buy you the Dec 2006 car, then a 2008 DCT is going to be a lot more money. If you where looking at 2, 2008 model cars I would go DCT for the same or a bit more money, but the Steptronic shouldn't put you off, it is very good for an autobox!
2008 E93 335i, MHD, HPF IC, Injen Intake
2016 X5 M-sport 35i JB Stage 1
2013 Mercedes C63 AMG ROW airboxes, power pipe, Eurocharged V6 Flame tune 540 HP