I love writing with fountain pens. They are deliciously old school, and put ink on paper with an effortlessness that a ball point just can’t match. Modern cartridge pens have also pretty much eliminated the ink-all-over-your-fingers-and-clothes problem presented by the older models.
While you could potentially spend hundreds of dollars on a Waterman or Mont Blanc, I have found that the Pilot Metropolitan line offers a very good writing experience at an amazing price point. A Pilot such as this can be had on Amazon for less than $20. Pick up a pack of ink cartridges, and you’re ready to go.