Just read the thread on the Viper board... seemed pretty civilized and the minor inaccuracies (tires, difference between '91 and '02, etc.) no biggie.
A Viper is certainly on my list of cars I'd like to own one day... I'm thinking a Yellow ACR with a black stripe... the last year of the GTS body style so I'd have the ABS... hey, given how aggressive and over the top these cars are, you might as well go all the way
I've driven Vipers fairly extensively... two stock GTSs, an RT-10, and a modified GTS with near 500HP.... they're beasts, they're American in quality, the hood goes on forever... but damn, the torque. You can be in any gear and the power is simply there, and a lot of it.
They're difficult to drive hard, but if you have the skills they are incredibly track worthy (Paul Mumford and many others I've shared Willow Springs and other tracks with more than prove that)... though I don't care for the visibility and road feel...
The other day my good friend who owns a GTS and I swapped cars back and forth (I was driving my 360) and it's amazing how cars with similar performance can be so VERY different... the Viper seemed very large and unwieldy, but torquier, and the 360, when I hopped back in, a tight, precise go-cart
Anyways...
Oh, as for brakes, having tracked my Zanardi extensively I honestly like its braking better than any of my cars...
The S2000's brakes are a little weak, but feel good.
The 996TT's brakes are powerful, but you really have to push on them before they really grip (much like the rest of the car in spirit: the suspension doesn't seem tight until you push it, the engine is mellow until you wind up the turbos, etc... the car is meant to be relaxed until you really get on it, which overall is fine, but I just really like brakes that grab right away).
The 360's brakes grab a little inconsitently... the car does brake better than the Zanardi, but the NSX's feel is smoother, more progressive, and more predictable.
As for track readiness, the Zanardi, 360, and 996TT are all great -- I've not experienced fade or any other issues, even after many laps at various tracks, driving at 8/10ths. Only the S2000 seems a little weak after driving it hard, but I forgive it
The most disappointing brakes I've encountered were my friend's Integra Type R's... I think the first time he tracked it the brake fluid boiled and he had fade... he had to put different pads on it, bleed the brakes, and put in higher grade fluid, which I thought was pretty lame... if Honda's going to call a car a Type R they damn well ought to put trackable-grade brake fluid in it stock.
-Z18