+1 for UTF-8
Take it from someone who has done more than his fair share of solving internationalization and character encoding issues that UTF-8 is the current defacto standard today across a wide range of technologies. It's almost universally agreed that specifying ISO-8859-1 as a default was a regrettable mistake from an earlier era before internationalization matured. There is an old proverb "no matter how far down the wrong road you've traveled it's never too late to turn back", that could be the motto for ISO-8859-1 :-)