Have a Nikkor 50, 105 adn 150 which I think are really nice. The 150 is an older lens, spent more on getting it mounted than on the lens, but it is sweet. Use the 105 and a Beseler 80 for 6x6 and 645 and like both. Each lens you mentioned is good, but I agree unless you just prefer a new one, I would check out the used market, lots of good glass out there for a lot less $.

Good luck.