Trey,
I can honestly say the G35 rocks, Many of who say the P11 owns the G35 are sadly mistaken there is NO subsitute for RWD, drive one hard and you will see what im talking bout.
Ive taken off ramp corners at 80 mph with no hesitation , something that i would never atempt in my B14 with out tapping the brakes.
It corners better ,stops better , hold the road excelent, and looks the part .
Besides the aftermarket is big and parts are easily avaliable.
the P11 has given you many headaches, dont get me wrong i like your car and im sure you do to but its for the same reason your thinking of moving on to somthing that suits you.
I would say Do it!
good luck with the sale im sure it will sell quick.