Waterlox = Good, but pricey. Unless your interior door is going to be assaulted a lot by an overactive animal, most any of the topcoat finishes should work just fine. I did 13 red oak 6 panel doors in our previous home and used two applications of Minwax Poly Urethane (1st gloss, 2nd semi-gloss) brushed on with a natural bristle brush. No problems. If the door surface is going to be subject to direct or bright sunshine, I'd opt for a finish with a high UV content.
I've gone out to find myself. If I return before I get back, have me wait for me.
"Sawdust is Man Glitter"