Klick,
Search for Nikon lenses, its most likely that Nikons website has them listed nicely. I found a site for Canons.... here's the bottom line, as the price goes up, quality goes up. To get these ultra professional looking results that you see from Bone, Pope and others... you will be looking at $800-$6000 lenses... Especially if you are looking for a big zoom. You can get a pretty decent around the house lens for like $600 I"d bet! But whats crazy is...you can get that same lens, faster, for say, $1800...its all about the speed....
Good Luck. I think if you do some rentals like suggested above you could get some good ideas...but then again...that is expensive too!
My wife and I are buying a Canon DSLR soon and will be using the Kit lens for quite a while... however, I could see renting a real nice lens and using it for a week to take family portraits and such... or to go to Yellowstone or something like that....