If you keep DX format, such as D300 or D7000, you should get a Nikon F4 12-24mm or F3.5-4.5 10-24mm. 14-24mm is for FX, if will work for you DX cameras, but it will be a waste if you are not going to upgrade to FX format.
If you keep DX format, such as D300 or D7000, you should get a Nikon F4 12-24mm or F3.5-4.5 10-24mm. 14-24mm is for FX, if will work for you DX cameras, but it will be a waste if you are not going to upgrade to FX format.