A G37 is a really nice car. To me it's a 2+2 Z car. Where as I never much cared for the 2+2 Z's (when they made them) I really liked the G37 as soon as it came out.
I probably would have bought one, but a snooty Infinity car salesman sized me up when I walked into the show room and couldn't be bothered going to the trouble of letting me test drive one. (He saw me get out of my 1 year old Honda Civic).
Just as well, If I had bought one, I probably never would have wound up with my Crossfire. So it all worked out good in the end.
I'm sure you will really enjoy the Infinity.