I just recently discovered the LAMY Safari pen! It's wonderful and now I just can't seem to go back to the Microns, Staedtlers or such that I used to use regularly. The Lamy pen is a fountain pen and it is delivered with ink patrons but you can chose a converter to fill it up with your favourite ink.
This is some kind of a revolution for me!
The Lamy pen is delivered with M-nib (medium size) but you can chose from Super Fine nib, Fine, Medium and a few others.
I can really recommend the Lamy pen. It's cheaper than custom made fountain pens and the nib is so smooth and makes an even line and doesn't stick if the paper is more "toothy" either.
Here is a link:
Good luck in finding your favourite pen!