I'm leaning toward SE Asia for the site of Atlantis these days.
Now, about Thera, I'm not gonna throw out the 1628BC date just yet. There's a lot of (other) supporting evidence for a major eruption at that time.
AFAIK, there isn't any supporting evidence anywhere for it. The stuff that got buried isn't from that long ago (not by a long shot); there's no evidence that the island was abandoned for a long time, and no human remains have ever been found; the houses appear to have been stripped bare, suggesting that earthquakes tipped off the residents that they'd better get out; there's no literary evidence for any eruption there (apart from the 200 BC eruption); there's not even a blown-out city core -- the caldera is prehistoric.