Im just over 6ft 6 and had the 350z roadster, no issues for me with the head in the wind, just the odd bitof sunburn.
Be very careful looking at the roof though as some leak and some have pulled at the lining joints.
No real noticable difference on the road between the two to be honest.
Regarding rwd just be sensible with it, if you boot it around a corner or off a roundabout in the wet one thing will happen and it will be expensive, just be sensible and learn what the car will do under various circumstances and then enjoy
Good luck with the hunt.