This page gives you the top rated servers on GameTracker. Whats really nice is it even gives you the country flag so you know where the server is.
http://www.gametracker.com/search/ff/
Right now this is the most popular EU server shall we say.
85.234.148.39:27025 !! INX-Gaming.co.uk >> PUB|100Maps+Rtv+Fast Dl|