I'm finally got look into a wide-angle lens because I'm sick of my 18-135's nasty lens flare, distortion, and weak corners at 18mm. Well, at any focal length on that lens really. Now, do I got with Nikon's DX format 12-24mm f/4? Or do I go with the new 14-24 FX format f/2.8. I have a D300, so that's a DX format camera, but after I use this one for a couple years I intend on going full-frame. But that's not absolutely guaranteed. So, do I go with the lens I get the best use of for a couple years, or do I go with the lens that I will get the best use of in a couple years and for the rest of my life?