Whether I end up with the GTR is one thing but this forum is certainly a community I want to belong to. Kudos to you all for your kind words.
I am aware that the list is a little expansive (and expensive, pun fully intended

) but I have trouble working out what I want. It seems I desire the best of each world but that is rather unrealistic. Here is my own justification for the vehicles on my list:
GranTurismo - Beautifully crafted and devilish engine note. The backseats are surprisingly generous, especially when compared to the ones in my M6.
SL550 - There is a reason this is the flagship vehicle of the most successful luxury car manufacturer in the world. Perfect at what it does however as many of you have mentioned, its a little on the mature side.
CLS63 - Don't have much knowledge on this but what I have seen thus far, I like. Good appearance and seems rather exclusive at the moment.
BMW XM6 - I don't like SUV but I am trying to clutch at straws here. Well you see, I have been a customer of BMW ever since I started driving (I had a 530i as my first car before moving on to the M6 two years later) and the free maintenance is always a huge perk. Too bad both the new generation M5 and M6 are still at least months to a year away respectively.
Panamera - Amazing handling for such a boat but its hideous and until now it still hasn't grown to me. Interior is actually rather 'cheap' but maybe thats because the one I test drove wasn't adequately equipped.
GTR - Best bang for the buck and exterior is gorgeous. I guess I will reserve my comments in regards to the dashboard before I get tomatoes thrown at me. And oh, micro, almost nonexistent backseats.
And there is the dilemma. Fortunately I still have time to consider my options. Thank you all once again for all the help thus far.