I had a Tamron 17mm, don't know whether it was an SP version, if SP means anything that is, but it wasn't that flash, so I onsold it to a student who thought it was marvelous. One man's rubbish..........
Another lens if you are going to go wide, is the Sigma 18mm f3.5. It does not have a filter mount, but one can be fitted by a reasonably proficient camera technician.
I have one of these fitted with a 72mm filter thread, works a treat. Not as good as the Nikkor 18mm of the same size and speed, but literally 1/8 to 1/4 of the price of a Nikkor.
The best thing about this era of Sigma lenses is that they are made of metal, therefore are quite strong, plus they focus the same way as Nikon and Nikkor lenses, which to me is a very big plus.
In the mid eighties through to the mid to late nineties, Sigma Nikon mount lenses, were one of the better after-market brands of prime lenses around. The Vivitar Series 1 were optically about the same, but their focusing direction I don't believe was the same as Nikon and Nikkor lenses, this could be an issue with you.
Mick.