My current favourite is the PaperMate Ballpoint Stylo Bille (can buy them in packs of 10 on Amazon) although on the pricey side, they glide very well and the ink is similar to that of ink pens. They don't need any pressure really to use and so my hand doesn't tend to work during their use. Only problem is that it doesn't have a massive life span compared to biros and other brand's.