Considering that the Z8 is selling for WAY over list price (I've heard of prices around $300K!), I feel I got quite a bargain with my M5. Same engine as the Z8. Same top speed. More amenities and creature comforts, and a usable back seat and trunk. I don't get why anyone would want a Z8 when you could get an M5 and an M roadster, and still have money left over!