I cannot afford the Nikon 14-24mm for wide angle, so I was trying to find my best alternative to get extreme wide angle shots on my D700. Thanks.
The nikon 20-35 f/2.8 is a pro lens with a great reputation. Prices are going to vary alot, anywhere from $500 to -$700. I dunno if it's wide enough for you but alot of pros liked this lens, alot. You'll appreciate the build quality that's for sure.
A used Tamron 17-35 can usually be had for $300 or less and is a nice alternative to the pricier Nikon 18-35. It's faster too.
I presume the Nikon 16-35 VR is too expensive? It's worth of consideration as despite only being F4, the VR adds a lot on some shots...