>I am interested in planning for where I might need more than >one editing tool, such as CS6 and DxO. I am assuming that I >would need a common format to pass the image between them. >such as TIFF.
For that case, yes, using ViewNX 2 to convert to 16-bit TIFF with LZW compression is probably a good way to go.
Along with issues of compression, note that JPEG is an 8-bit format. Whereas the 16-bit TIFF will give you 16 bits per channel for each pixel, JPEG gives you only 8 bits per channel. So even if the compression is lossless, you are still losing some data. This becomes especially problematic if you are processing the image through multiple editing steps. I would not use JPEG as an intermediate format at all.