+1 for Rotring (or rOtring if you prefer). I have both a pencil and ballpoint pen, the latter has been my daily driver for over half a decade now. Refills are readily available, it's all metal construction so I can throw it in my bag and not worry about it getting banged up, and it feels really nice in my hand.

They are more expensive than my other go-to, which is just a Pilot G2, but truly BIFL in my book. Also worth buying a 4 pack of G2s in my mind if you let people borrow pens a lot, I've had countless of mine walk away...