I had a 2001 Z06 and loved it. Owned it for about two years, during which time I autocrossed it every couple months with SCCA and the Corvette Club. Drove it to work on a daily basis.
About six months ago I sold it and bought a '97 Viper GTS and I will never look back. It's hard to explain why I like it so much more than the Vette. It's an emotional attachment, and ultimately, the Viper is much more fun. It's more fun to drive, more fun to look at, more fun to own.
Yeah, the heat issue is overrated. Yeah, it's warmer, but you're not cooking or anything. Big deal. Roll the windows down. And the brakes, get one with ABS, or buy a set of Tom's rear 40mm calipers and put your mind at ease.
-Chris