"Online stuff" is usually better the the photoscenery that you can buy from commercial vendors. In the US in particular, odd colors are pretty rare in modern data sources, not like a couple of years ago. Go to Africa or Sth America and yes, finding tiles is a nightmare. Western Europe is pretty good too, it all fall apart when you head over to Greece or further east. But UK/France/Germany/Switzerland/Spain etc have very decent data.
Please share what you know about Western Europe sources. I'm completely new to this. I loaded up FSET and got it working with Virtual Earth as a data source, but if there are better sources with more/better detail, I'd love to know about them. Tips on settings too of course.