Any Euro accent I find extremely attractive, I had a friend who was English and spoke French fluently, so our group of friends regularly had her say random things like, "I am going to the store to get cleaning products." or "You are an idiot!" Initially, she didn't catch on what we were doing; then she began to say these things more seductively. Everyone fell in love with her. Good times.
The Aussie accent is a good one too, but I think it's the attitude combined with it that makes it attractive.
Southern US accent, now that category is VERY broad. Different regions and states all have that southern Twang that I love in some women.
Just throwing this out there, but I was unfortunate enough to grow up in an area where there was an accent, and I hate the fact that I do not have one.
Now I don't like the Filipino accent, there are reasons, but mainly I try hard to understand them and I can barely understand what they are saying.