I think NAS has driven me mad . I'm toying with the idea of selling my D300 and the handful of DX lenses I have and upgrading to a D700. Out of my DX lenses the only one I think I'd really miss is my Sigma 10-20mm. I'm rationalizing this to myself by telling myself I won't be laying out too much cash. So spending a large amount of additional cash, splurging on 14mm prime or 14-24mm would blow that! Are there any reasonably priced (ideally < $300, definitely < $500) ultra-wides or wides that perform nicely on FX? I'm open to pretty much anything - zoom or prime, nikon or other brand, AF or MF, new or used, just so long as it'll mount and meter on a D700. Can anybody help me out with a recommendation?