This echoes quite a few things I've been thinking about lately on and off, and for some reason I have previously found myself looking through the BMW website at the 1 series, then I found this thread!!!
I can't think of what I would want to replace my current car with in the future, I feel like I'm waiting to see what happens with the MK8, Seat, and A3 offerings. For me it was usually a case of seeing the newer model of a car and instantly liking it and wanting to upgrade, or just getting plain bored after 2 years and having my head turned buy something else, but lately I still feel happy with what I have and don't feel the need to spend my money. Maybe that will all change when I start seeing things in the metal.
One thing that my Wife keeps saying is that if I am wanting to keep changing cars then I should go on PCP like her friends, they're driving the likes of Clio's and nothing as exotic as my tastes. I'm not so sure myself as I feel the monthly payment would be higher and at the end of the term I'd not want to fork out the balloon payment for something I've owned for years and be forced to change, but my point is that I'd feel stuck on that route and couldn't simply keep it when it's paid off at the end of a normal loan if my circumstances or mind change. Food for thought for me.