A nice pen is... nice. But it's as easy to fall into geeking out about pens and paper as it is keyboards, knives and other kitchen utensils, tools, etc. In most cases, any pen is as good as any other. Or just find a cheap mass produced pen that feels good in your hand. They are plentiful. Then buy a stock of them.

I actually like using pencils, with a thick lead because I tend to have a pretty heavy hand when writing and I will continually break a thin lead.