(Warning: pen geekery ahead)
I did turn up a Pilot Knight that I'd forgotten about, and realize that a Parker Latitude has gone missing. Hmmm. Also, various Sheaffer calligraphy pens dating from the time when my ambitions outweighed my skills or patience, an all-too-frequent happenstance these days. I realize that I've tended towards pens that use the "standard" (international-end) cartridges, since I have a couple of converters around that fit and will let me use bottled ink. The pens that have their own proprietary systems -- Parker, Pilot, Sheaffer -- tend to get kicked into the back of the drawer once their supplied cartridge goes dry.
So, I know for certain that I'll be getting some blunt-tipped syringes to allow me to refill old cartridges, and/or pick up brand-specific converters to let me press these orphans into use. But that's the only amount of certainty I have right now. At the moment, I'm waffling mightily among the Lamy 2000 and the Namiki Vanishing Point, though the VP may win between these two, based purely on the descriptions of feel. The other one in the running is a Pelikan M200 or 205, because oooooh, piston-fill and oooooh, swappable nibs and so on. You can't beat the ease of refilling a piston-fill pen, with no mucking around with cartridges or converters or syringes or any of that.