The Pentel EnerGel Alloy, at $5 a pop, is by far my favorite of the accessible pens. They write smoother than anything else I've tried, which is the most important factor in my mind. The silver barrel ones (combination of aluminum and plastic) are by far classier than any other $5 pen, but they're also $5, which means you never have to stress about losing one or giving them out. They're also sold at Walmart and the refills are plain old Pentel EnerGels, so very easy to use. Absolute 10/10 pens.