Fountain pens, like clothes and watches, are a matter of personal taste.
I have a number of fountain pens that I both use and look collect. For use, I'm partial to piston filled pens, as I use a lot of ink and cartridges are expensive and converters never seem to work well. As for nibs, because of my work, I prefer fine ones.
I'm not a huge Montblanc fan. They're kind of like Rolex in my opinion: they make a good product that costs two to...