The C4S is my favorite 911. Assuming you don't mind not having a new car warranty and paying for the maintenance costs, go for the C4S. Seeing that you already have a Porsche though, maybe mix it up by getting the 135 and have a couple of fun cars to drive. It is nice to order a new car exactly how you want as well. Definitely a dilemma.
EDIT: Just realized you already picked up a C4S.
Delivered in Munich, broken in on the Nurburgring.
Last edited by JasonCSU; 05-21-2010 at 10:49 AM.