I've always written in 1st person, too, but for NaNo I'm doing 3rd person, and I've gotta say, I'm falling in love with it. It works perfectly for this story, since I need most of the characters' insights, and it's fascinating to see how they regard each other, imo. I'm also really enjoying being the sarcastic narrator and making snide remarks about the characters.
I don't think I could write it for a romance, though, I feel like it would come off as cheesy.