i finally know mine as well: shakta & moonweed - micronesia. ftw.
it's a very personal thing indeed: this was the tune that really got me into it, but i only got to know the name a few weeks ago or so (thanks again to anoebis for suggesting it )
this tune downright embodies what goa is to me; it has THE goa atmosphere...darkish, spacey, alien, melancholic...feels like hovering through the milky way, all encapsulated in my tiny spacecraft with transparent walls, nothing else around me than the beauty of the universe. it sounds like god speaking, "yeah buddy, i'm here".