New to the nikon family, what are the best non nikon lens?

Sigma 70 f2.8, 85 f1.4, 70-200 f2.8, (w/OS) all have good reviews. Sigma 150 f2.8 non-OS is an excellent lens.

Tamron 28-75 non-BIM , 60 f2, 90 f2.8, 70-200 f2.8 (sharp and excellent contrast but Slow AF).

Have not tried Tokinas but the 105 f2.8 is supposedly very good.

Have not tried Zeiss lenses except 100 f2, which is absolutely the best glass to ever grace my D700. The 21 f2.8, 25 f2 and 50 f2 all have great reputations.

--
Cheers