Thanks for the advice guys!
Looked into the Infinity G7. Nice looking car, but it doesn't look like they make a manual sedan, and I couldn't stand to drive an automatic.
After thinking about it more, I'm pretty sure I want 6 cylinders, instead of a turbo charged 4. The one thing that I've love about my mustang over the years is that I've felt I've always been able to accelerate when I've wanted to, so that's just how I drive.
Pretty sure the other thing I'll have to have is AWD. The worst thing about my car has been a rear-wheel car with little weight is terrible for things like rain, ice, or turning.
Going to check out the BMW 328 and 335 stuff this week. The WRX sounds nice if I can get a spoiler free version =P