If you don't want a MB, why the Crossfire? It's a low end rebadged MB.
The SC's are nice, but sorta feminine and (IMO) over priced.
The G35 coupe/sedan's are real nice. I have seen both up close and have driven the coupe.
The G35 sedan looks a little plain even with the sports package, but is a very well rounded and balanced car.
If you can hold off, Lexus will be introducing several new models (can't wait to see the new IS) within the next 14 months or so.
Lexus is #1 in the luxury market, but have been losing market share due to a lack of competitive models.
That's gonna all change soon.