I'm pretty sure that the graphics in the new 17" Macbook Pro will be okay. Nvidia have had months to fix the problem and I'm sure they will have to save all the bad publicity and press.
And if it does go wrong, you are covered with 2 years AppleCare on it (1 year standard plus the extra year announced by Apple for notebooks with 8600's).
Also there is nothing to say that EVERY 8600 will fail. It might fail in 1 year, they will replace it, it might fail in 6 years, by which time you wont really care.
Buy it, its a great machine.
The next update wont be until Spring 09 is my guess, and that will incorporate the glossy screen which you hate.