I don't have a particular favourite breed, although we are currently dog-sitting my parents' Wheaten Terrier and I'm really liking her. Good size (about 45lb), non-shedding!, fairly low key. She occasionally barks, but is generally friendly and is good with my kids.
I had a Dalmatian. A good one-person dog (I was a single student when I got her), but she wasn't good with other people or kids. I got her as an adult, and I don't blame the breed for her issues, but her upbringing (or lack-thereof). The only breed of dogs I don't like at all are Boxers. Bad experience with one as a kid, I can't stand them.