Jinhao pens are pretty good for less than a tenner, they usually come with a converter for bottled ink.
Cross Apogee was a real disappointment. Scratchy and frequent blockages despite trying different inks and nibs.
Pilot Capless pens have such a nice nib and are very practical. Good warranty support too.
TWSBI diamond 580 is my current favourite. The barrel is the ink reservoir do it writes for days without refilling, and has a nice nib. Also good warranty support.
Lamy pens always feel a bit stiff to me.
Cheap modern parker pens always fail for me, the lid does not stay on.
I have a kaweco sport. I like the idea of a compact pen. It writes well. The design depends on you posting the lid on to the body. I found the lid is always inky and it transfers to the body and then my hand. I don’t use it much any more.
Diamine ink comes in so many colours. However it seems a bit inconsistent and doesn’t always flow well. Most bottles are good, the odd one blocks my pens more than usual.