Considering Spain is the second best national team behind the US, I think it's a very good league. The Spanish players in the NBA (Gasol brothers, Rubio, Fernandez, etc) all played there before the NBA.
Looking at wikipedia, A Greek team has won 4 of the last 5 Euro titles, with FC Barcelona winning one. I think Spain, Greece, Israel, Turkey are usually the top leagues.
That's cool. Whenever I hear about an NBA player going over to Europe, it's always Spain, Turkey, or Greece. I hear about China a lot, just don't know much about any of them. Thanks.