It's always Wales first(obviously!), then Italy, then the other Celts. I say Italy because every rugby fan admires how they've progressed from a non entity to a nation who now competes fully with more than a few scalps now, most often at home.
I admire England and when Wales invariably drop out of the World Cup(should have won the last one) I always support any home nation left(invariably England) as I did when they won the World Cup under Clive Woodward.