I think you will be surprised how satisfying a good GranSport can be, especially with a bit of fettling such as Formula Dynamic springs, better exhaust etc.,.. As someone who is on their third GranSport variant and who also owns a 360 Spider I can tell you I don't regard the Maserati as a 'lesser' car than the Ferrari.
In fact now I have the GranSport MCV I think I would keep the Maserati if I had to choose between the two!
That comment about the 360 versus your Maser gives me encouragement that after purchase, I probably will not have that internal dialogue in my head each time I get in it telling me "You should have dug deeper into the savings pot and bought that 360 with manual box you always wanted".
Seriously, one of the things going on in my head is the same as the 911 Turbo purchase 4 years ago. Do I buy a nice C4S with the same wide body, suspension and brakes as the turbo for at least £10k less (but with an engine that would give me sleepless nights having to sleep with a sixpence under the pillow and the thought that if it lets go, it'll cost me the wrong side of £8k to strip and rebuild it) or do I spend £10k more and buy the Turbo which I always had as a uni student on my bedroom wall (and buy into a true race-derived dry-sump Metzger engine from the Le Man winning GT1 car) to fulfil that passion? I'm so glad I bought the Turbo first time and not via a stepping stone with a C4S. The prices of both have shot up - but the difference between a good 996 Turbo with manual box and a good 996 C4S is FAR BIGGER than £10k now after only 4 years!
Every time I get in the Turbo I remind myself what would it have been like each time I got into a C4S - that dialogue in my head saying "you should have bought the turbo!"
I feel that same sense with a Gran Sport versus a facelift 4200. Today, I'm 51% in favour of upping the budget and going for a GS and 49% for the 4200 facelift!
I don't mind the extra if the prices and return on a GS come time to sell in at least 5 years time makes it the better proposition. I'm not an investor, its just that I'd like to see neutral cost of ownership.