Forget about the 2x teleconverter. Also stay away from the very slow lenses.

Read what Ken Rockwell says about whatever lens you think you might like.
http://www.kenrockwell.com/nikon/dx-dream-team.htm
http://www.kenrockwell.com/nikon/10-best.htm

"There's more to optics than meets the eye."--anon

"...most of us would be better off losing half a pound around the waist than half a pound on our rifle."--dhg