I have an old 180mm Xenar (very old, uncoated) which I use if I absolutely need 180mm. And a newer 210mm Xenar, same qualifications.
Most of the time, at least the last year, I use either a 165mm f:6.8 Angulon or a 240 f:5.6 Symmar convertible. They are both plenty sharp for most purposes - if you stick your nose right up to a 40x48" print from 5x7" film shot with the Angulon, you may possibly begin to think that you can convince yourself that you see a hint of softness in the very corners. But you can't convince me!
Another great advantage of these lenses (except that they're cheap) is that I use bouth of them on 4x5", 5x7" and 8x10". Which has the strange side effect that I sometimes carry more cameras than lenses!