There are other flashier pens for signing things and looking important, but for a stealthy lovely pen the Lamy 2000 is the best.
This is the truth.
I have two 2000s: a black Makrolon with medium nib, and a stainless steel 2000M with EF nib.
These go with:
Cross Century II
Lamy Safari (white and Vista)
AG Spalding (wood and translucent bodies)
Lamy Safari (platinum grey with gold nib)
Dunhill Sidecar Chassis with an immense Bock nib, which a near miss on losing it means it now never leaves the house
I use bottled ink in all of them – always Diamine.
Other than the past few weeks when the urge to use a Lamy 2000 ballpoint has overtaken me (and the occasions only a pencil – Rotring, natch – will do), all my writing is done with a fountain pen.
I think a recent pay rise may warrant a new pen. Definitely Japanese, probably a Sailor (Pro Gear or 1911) or a Platinum 3776 or Pilot Falcon.