I have been wanting to upgrade from my D50 for a while. I've been researching cameras and I was wondering what everyone's opinions were on full frame vs. cropped frame cameras. The D300 and the D700 are some of my top options, but with the D300's DX sensor, I could get a substantially nicer lens with the extra money I'd be spending on the D700. Is the FX sensor really worth it or should I stick to a crop frame model and get a nicer lens? Also, I have not fully committed to Nikon yet (only bought a 50mm 1.8 lens so far), so Canon users, I'm open to suggestions here too!