sigma 70-200 f/2.8 OS for my nikon D5100. Newest version. $1300. Can't wait to get it.
I'm no pro or anything. Just need a good glass for those low light shots such as early bass fishing. A picture of the bass splashing after getting hooked will be ducking awesome.. i have a decent 55-200mm F/3.5-5.6, but too slow in low light. Will do fine with a lot of light, but by then, fish won't be hitting as often anymore.
This lens could be an all around lens too esp. for portraits. I wanted a used nikon version VRI, but hate used electronics and it cost the same. Wanted the VRII version, but $2200 for it isn't worth it.