@snowyowl:
If you like writing utensils, I definitely recommend investing in a good fountain pen. Like pipes, fountain pens may require a lot of trial and error. You don't want to spend a lot without knowing what you'll get. There are some very nice inexpensive pens too. You need to decide what you'd want in a pen, and do a research.
But if you like that Uniball, it means you're more into XF nibs. For starters, I suggest looking at Japanese fountain pens with F nibs. Japanese F nibs are close to Western XF nibs, but a tad broader, just about the same size as your Uniball, give or take. Btw, there are a lot of nice writer pens for people with a tight budget. So don't think you need to spend a lot to get a good pen. It's basically similar to pipes.
You might know all this stuff already, but since you said you've no "Dunhill" pens, I assumed you might need a direction in that regard. I might have been wrong, if so, I'm sorry.