Okay, thanks for the input! I think I've decided on the Interlux Interstain product for the filling and coloring. I would have just gone with one of their varnishes (likely Goldspar), but you've turned me on to the Epifanes varnish.
When it comes to Epifanes products, it looks like the "Gloss Wood Finish" is a bit pricier than the regular "Clear Gloss Varnish", and I see that it does not require sanding between coats. Does it hold up as well? It seems like perhaps the regular varnish is tougher... but easier scores points here, as well!
At any rate, I now feel like I have a full picture - thanks again!