Another great Komine-made Vivitar is their Series 1 28-90mm f/2.8-3.5. I've used that lens for many years, first in Canon FD and later in Nikon F. It is a fantastic lens and can usually be found for very affordable prices. Ed mentioned the Tamron 80-200/2.8 LD -- I will second his praise. I haven't had mine for as long as he has, but I also consider it to be a superb lens. Actually, in general, I've found Tamron lenses to be a great value, especially the SP line. I have a rather extensive Tamron collection, in focal lengths ranging from 17mm to 500mm. Some models can get kind of pricey, but they're worth it. As for Tokina, they're another aftermarket brand worth considering. The Tokina 17mm is a superb ultra wide. The 90mm macro is legendary. Their AT-X line of zoom lenses is also quite good. The stand-outs are the 80-200/2.8 SD, 100-300/4 SD, and 150-500/5.6 SD.