Thank you all for your great advice. Little by little, we're educating ourselves on Greek geography and beginning to put a plan together.
We're kinda sold on the idea of spending only 1 night in Athens upon arrival, walking around the Plaka and doing a little sightseeing that first day, then coming back to Athens at the end of the trip.
We did that in Rome last year. Flew in there, spent a rainy afternoon walking around a little, had a great dinner at an established Mom & Pop restaurant down the street and hit the sack. We got up early the next morning and went down to Amalfi, spending a week there. After some time in Florence & Tuscany, we came back to Rome and spent our last 5-6 days walking everywhere. What a blast.
We've picked out a couple possible destinations at this point. We don't want to spend all our time traveling. Made that mistake earlier this year on a 12 day whirlwind through Austria, Czech Republic and Switzerland. Will not do that again.
Santorini looks very nice. How many days would you all recommend on Santorini? Is it possible to day trip around from there? Maybe I'm wrong, but I don't see a reason to spend a week there, unless you just wanted to go and relax and soak up the sun and enjoy the views.
Nafplion looks interesting for the history. Is there enough to keep us interested there for a few days? Again, are day trips a reasonable expectation from that locale?
Thanks again for all the helpful advice.