Errrrr.......Tamron ? ;) For that kind of money I'd reccomend a Sigma 28-80 2.8 or a Tokina 2.8, but certainly no Tamron. Both the Tokina and Sigma are aprox $250 cheaper and especially the sigma is MUCH sharper through all apertures. Uhmmm, one thing that you shouldn't forget is that one 2.8 lens doesn't let the same light in at a whole range of apertures like another 2.8. Lenses like these are usually the sharpest somewhere between f/8 and f/16, while the $2,000 Nikkor 28-80/2.8 is just sharp at any aperture ;) In other words, the Tamron might let you shoot at great speeds in low light conditions just like any other 2.8, but the results might be noticably (is that a real word ?) less sharp. And that's a shame for a D100 :) As far as I am able to judge it the Nikkor (not 2.8, but the one in the $600 range) and the Sigma 2.8 are by far the best lenses. Just a personal opinion ofcourse :)