Amos - sure, there is "such a thing as right living, and avoiding extremes and other well-thought-out policies can lead you to" - and here is where we diverge -- I would then end that sentence with the word Happiness. Furthermore, since we know that it takes science to help one "discover more and more about [one's] nature and the nature of the universe" there is no need for the word "spiritual" in there at all, and suddenly, instead of being Buddhist, you're just (boringly?) sensible.
And for your later post: The basis for good is nature - pain is bad, pleasure is good; truth is good, getting caught lying isn't (but NOT getting caught, is). The only thing people add (in contrast to other animals) is that *others'* pain and pleasure makes it into the equation. No need to posit any supernatural anything laying down the law of good and bad, it's already a given.