[Mee-n-Mac]

Just remember that Ritz filed for bankruptcy this year. That means maybe "your" store will be closing ... or maybe not. Perhaps you can get a deal but I doubt it, their prices were always high and last store I visited had a pretty limited stock.

You may be better off perusing the forums for the camera of your choice and seeing what lenses are highly thought of. But first you've got to choose you price range and weight limit. As said above a fast lens is big $$ and large and heavy. If you're not a pro or very enthusiastic amateur you might find an f/3.5 - f/4.5 a reasonable compromise. Also remember that most of todays dSLRs have an APS-C sized sensor so effectively your lens is 1.5 or 1.6 times "longer" (ie : a standard 70-210 acts like a 105-315).