I didn't really need a new fountain pen, I have several, but I liked the look and feel of the Kaweco AL Sport. They have a cheaper plastic version but it was too light, this aluminium one is a better weight and writes really well.
It takes standard international cartridge and you can buy a converter if you prefer bottled ink.
I guess I'm old fashioned in this day and age, but I still use a log book at work and use a fountain pen and pencil to write up all my work.
BTW I got stopped at security on the way out of Bangkok on Thursday due to ink cartridges, the girl seemed to think they were some kind of ammunition...