We could talk about keyboards instead, but... I dunno. They're overrated. :p Let's talk about pens and pencils. Things you use to write with.
I usually swear by rollerball pens and mechanical pencils. Pencil sharpeners get messy, and I like rollerball pens because they feel fluid when you write with them. (Not a huge fan of ballpoints...)
As far as specific models go... I got ahold of some Pilot Precise V5 RT pens today. I'd say it's about a medium size barrel. They barely weigh anything at all, but they write NICE. The pen I was using before that was a Uniball Vision Micro. Those pens... they'd keep their point at first, but it seems like after I wrote with them for a while they would lose their point and start writing thicker. Then again I tend to apply a lot of pressure when I write, so maybe that's to be expected.