A few years ago my wife let me buy myself a Pelikan M800 fountain pen, a bit of a grail pen for me.
I was considering a Pelikan R600 or R800 rollerball to go along with it, but they're just too much money for me to justify.
This Lamy Swift looks kinda cool.
I'd consider another German RB pen, maybe a Kaweco or Lamy if not too expensive.
I think I also kind like these, take Fisher Space Pen refills.
What do you guys like for RB pens?