Being left handed presents special challenges to the penmanship issue as you are pushing your hand over the area you just inked, so you have to go slow and be careful.
Several years ago I began signing cards and notes with a fountain pen. It took several tries before I found one I liked. They feel so smooth and personal when you move them across paper. I enjoy the process of filling the ink from the well, and coaxing it back into service after it has sat for a bit.