1. Probably my choice.
2. Autos (even sorta autos) are so much less fun.
3. If you really just want to burn a butt load of money, haha.
4. If you just want something that can handle 99% of what you run into, I'd say go for it. The Porsche is infinitely cooler than the GTR though.
Speaking as a horrible driver (well, I'm a good driver, but I'm poor at launching and slow on shifts), I put an auto in my car to crutch that. I put a stick back in, in the long run.