bmwboy, my friend's Miata is a 2001 model in stick shift (I don't think I would bother driving it if it wasn't), it has 142hp I believe. When I drive it, I will not hold its "lack of power" against it as I will be looking at the overall driving experience. I don't know if it's the Sport package or not, is that even an option for the Miata? If it is, my friend probably took it as he was not in it just for the convertible aspect of it (his father owns a Miata as well, and is a big fan of the vehicle).
As for the G35 Coupe, I am having an excellent time with it. Since you are fairly new to the board, you should know that I am a BMW fan, through and through. I originally came to this board wanting an X5 3.0i, then changed to the 330xi, then to the 330Ci. But then the G35 Coupe came out and I loved what it offered (280hp V6, Brembo brakes, great handling) and the styling also got to me. The acceleration of the car is fantastic, the luxury is great, and the handling and braking are great (although I think the 330Ci can ultimately handle the turns faster). It is very much like the Japanese version of the 330Ci, but being Japanese it comes with some bland-ness to the driving experience (handling is not very predictable, the vehicle is extremely tail-happy without warning). It really is a great car, very well-made and feels rock solid just like a 3-series. I don't regret getting the car, but next time I will NOT get the Japanese alternative.