I think we can do without extensive discussion of digital techniques, but the issue of the neg scan vs. print scans is different.
What if the neg scan is more faithful to the print than the print scan?
I've never seen an image on the web that looks remotely like a print. A screen that emits light is just different from a print that reflects light. Every monitor renders tonality differently. Any image that is scanned is manipulated, whether you do it in Photoshop or an image editing program, in the scanner interface, or whether you just select the scanner defaults and let the program do the manipulation for you, often involving adjustments in tonality, white balance, and sharpening.
My own procedure is usually to scan the neg with print in hand and to try to make the closest approximation I can in Photoshop. If I can, then I'll compare the print on two or three different monitors and make sure it holds up, and might make small adjustments again. As I see it, this is analogous to printing for reproduction, as opposed to printing for exhibition, acknowledging that the process of reproduction is distortive.
The real response to this conundrum is to use the web images only for reference, and remember that these are only tokens of the real work. Participate in the print exchanges, the postcard exchange, and the traveling portfolio, and if you want image critiques, post in the gallery, and ask people who have seen the real prints to comment. This works fairly well in the Travelling Exhibition gallery over on the f32.net discussion board.