You sound a bit like me, just into a new car (well new to me usually) and already planning the next one ..
I think the problem is (well for me anyway) I get bored easily, it's sometimes not the fact you dislike the car you have, you just get bored of it and want to try something else. I know that at the moment I enjoy driving the girlfriends cars more than mine (it's a 4.8iS X5 E53
) but I had an X5 myself and sold it after about 3 months. I think I like driving her car for a number of reasons - it's not mine, I don't drive it that often, and I seem to be in a more relaxed, potter around chilled mood at the moment so her car is better for that, and I can't get enough of that V8 burble ..
Have you thought about 2 cars geefunk1978? I used to run an old Mitsubishi Pajero, alongside an RS60 boxster spyder .. want big, comfy, slow, don't care what sort of state it's in - then take the Pajero. Suns out, fancy a hoon - take the Porsche. As you were always changing what car you were in, it always seemed like more of an event ..?
Sounds to me like you need something like an Mk5 Golf GTi for a sensible hatch, and something like a Caterham for all out fun?