If you plan on going to any HPDE's I would recommend the Ferrari. If you want a gorgeus sports car that is fast, and comfortable get the Aston.
I dont think you will be losing which ever one your pick.
And, I understand your thoughts on not buyin the first year out. But, Ferrari will not dissapoint, even on the first year out.
Mitsubishi might disapoint

, not Ferrari...
You need to race that M5, that will take your mind of any other cars.