I propose:

Save/Save As...:
Saves the current file as Inkscape SVG or SVGZ. No other options are
given because all other options would be lossy.

Save a Copy...:
Saves the current file under another name without changing the name of
the current document. Again only SVG or SVGZ.

Export...:
User may choose from a number of lossy formats, vector and bitmap, with
all of the various options for selecting areas etc.


 From the discussions I've heard in the last few years on this topic
these three options would offer the functionality that users see in
other apps and request of Inkscape with minimal confusion as to what
sort of editor Inkscape actually is.


Aaron Spike