Sharpie S-Gel Fine Point (0.5mm)

I put this pen out on the email signup clipboard at work, and without fail customers compliment how smoothly it writes every time. Good for writing, less preferable for drawing—I tend to lean towards an oil ink, though I do like the 0.5 tip for linework. As far as cheap gel pens go, this by far exceeds the much loved Pilot G2.