Drive them both and even drive the 350z. I didnt like the 350z as much as the S2k and almost bought that but then I drove the G35 I fell in love, its a wider stance and handles just as good plus you have a back seat and trunk. A topless car isnt that great and is just another cost you will have to repair down the road. Plus sometimes its just too cold/wet/hot to have the top off and the climate control on the G is wonderful.