ALL "Professional" lenses are pretty costly these days. Canon and Nikon both. Even Sigma has gotten onto the high-priced bandwagon. Sigma has DOUBLED its MSRP for its 70-200/2.8 zoom lens over the last five years; up from $749 to $1400 or so...that is a lot of money for a Sigma lens that will have lower resale value than a Canon or a Nikon 70-200/2.8 model. The Tamron 28-75mm f/2.8 lens MLeeK is suggesting is one of the best independent wide-to-short tele zooms ever made...Minolta subcontracted Tamron to make and market it as a Minolta lens....SOny has continued that...Pentax too I believe is having the 28-75 design built in their proprietary dress...it offers about 90% of the optical quality of lenses that cost $1,000 more money, and about 65-70% of the build quality. It has become a TRUE "Cult Classic Lens", just as Tamron's 90mm Macro has been for the last 25 years or more.
You could also buy a used Nikon 80-200mm f/2.8 AF-D lens for less than half the price of the Sigma 70-200/2.8 at new price.
Still,while cameras and lenses are nice--I think you need more LIGHTING GEAR and MODIFIERS!!!!
I was not fully cognizant that the upcoming Canon 1DX was going to be priced at $8,300 US dollars....YEESH!!! And they are killing off the 1D at $4995 or whatever??? OUCH!!!
For those who want REAL high-ISO performance, used Nikon D3s bodies ought to be hitting the streets fairly soon. $3,000 seems like a fair used price, maybe as low as $2750,cash.