D-80 Lens

HI, everybody
I'm planning to buy a Nikon D-80 (body only).
Can u recommend which lens should I buy?
My main objective is people and landscape or should I just buy a kit set with 18-135mm lens?
Some people told me to get sigma 17-70mm instead of 18-135mm kit lens.

What do u all think?

Thanks

All I can say is that I am very happy with my 18-135. It focuses fast and is quiet.
No macro mode, though. Some complain because of the plastic body but I think it should be just fine if you aren't rough with it.