Danko is ALWAYS a win!
My Napa m.o. is always a morning tasting, lunch, a second tasting, rest, and then dinner.
I would skip Morimoto.
Torc in Downtown Napa is great. For Italian, there's the local favorite Bistro Don Giovanni (I like it, but don't love it). I prefer Bottega in Yountville, not too far away.
Other favorites:
Press (dinner-Saint Helena)
Charter Oak (either-Saint Helena)
Bounty Hunter (lunch-Downtown)
Bistro Jeanty (either-Yountville)
Auberge du Soleil (lunch-Rutherford)
Farmstead (lunch-Saint Helena)
Enjoy! I was just there last week and miss it already.