I’ve got a Lamy nexx, which I enjoy using. It came with a reservoir which draws ink up from a bottle, not just cartridges. I vary between Macassar and Bilberry Diamine inks.
I used to have a TWSBI, but the pump mechanism broke.
I also have another, fancier, pen with a swirly body. But it’s never been quite as nice to write with, and the lid doesn’t click on securely enough to put in a bag or jacket.