I have been using a couple of these since years, now. The Penmanship, though it's not very pretty, with that cap resembling a flying squid, is always a winner. Totally inexpensive (I could get mine for around eight bucks), a real Japanese EF nib, which is really thin and won't disappoint you like western EF nibs often do and it can also be used for technical drawing because the stiffness of the nib keeps the line steady and uniform.
I keep one loaded with black and one with Lexington Grey, in which the thin lines are impressive.