If someone can afford the new Viper coupe they can probably also get the Z4 M too. If I had to pick one I'd take the viper. The feeling you get from that car when leaving a stop at WOT is insane, it makes your stomach feel weird like being on a roller coaster, a feeling I have never gotten from any BMW including the AA S/C E46 M3 my shop put together last fall. Out of the box it my not handle as well as the Z4 but it wouldn't take much to get it there.
z4m for me.. ive driven a 2005 viper vert and it was insane, accel like no bmw ive ever been in, but at the end of the day i know th ebmw wont let me down, plus it has a more comfortable and natural feeling driving position (try driving a viper with your shoes on.. ha.. good luck if you have anything more then probably a size 10) ... plus the cabin temp doesnt increase by 50 degrees from ambient just from the exhaust like in a viper.
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