BDR,
The NGC gets mixed reviews, but for my money, I would have bought new if that was the price difference. I bought a used TM-3p and haven't regretted it, but I paid less than that. I added the 4th (found one that was still covered in shipping grease). I would point out that the warranty you'll get as well as the discounted tooling that comes with the purchase of a new machine from Haas should also be considered. I would sleep better at night knowing where my machine had been from day one too, but again, I got a good price. Just my $0.02. Good luck!
Everyone has already told you this, but the probe is worth every penny.
Ken