Wow, twins! I have to say you're extremely lucky. You might not count yourself in that boat, due to the massive amount of work, but I'd love to have twins.
I like
Anthony and
Sebastian, but I have to agree with you on
Taylor and
Tyler. Those names are annoying enough alone, but paired together they're like a volcano of molten trendiness.
I'd love to help with suggestions on your boy.
Rosalie is a cute name.