[medphysdave]

My initial instinct is to go with GT4. I think the CS will bring a different feel to your current list, but I think the GT4 will bring a new experience. I love the look of the GT4. Are you keeping current M2?

Any young kids in life that you want to include in this passion? If yes, go with CS as leaving them out will nag at you at some point.

I don't see the point of a "weekend" car as I drive less on the weekend. Id get whatever I would drive all the time.

I expect to get a CS allocation and still plan to purchase.

Edit:. I'm also assuming you can comfortably afford the GT4. Not worth it if you have to remove other enjoyments from life.