Wide angle Lens Suggestions?

Hello, I am looking for suggestions on a wide-angle(non-fisheye) Fast zoom lens, I take photography at really dark clubs/areas using a Nikon D5100 accompanied with a sb-700 flash with a Gary Fong(Clouded) attachment.

In general there is one Lens that looks absolutely amazing for what I am looking for but it costs about 2 grand and I'm not really looking to spend that much on a lens just yet

--> http://www.nikonusa.com/Nikon-Products/Product/Camera-Lenses/2163/AF-S-NIKKOR-14-24mm-f%252F2.8G-ED.html

I've been looking for a few weeks now, I typically use shutter lag with the standard Nikon 18-55mm 3.5-5.6 VR Lens.

I am looking to get more of a wider angle but still have a zoom capability while in "close corners" with people. I do not require it to be a nikon brand but atleast can work with AF.