Letraset Tria Markers are the next step up from Letraset Promarkers. They're refillable, and have 3 tips. I haven't tried them yet myself (though I will one day). I suspect that the tips given in this article would work for Promarkers, as well.
http://letrasetblog.com/design/5-top-tria-marker-tips-from-geoff-tristram
http://letrasetblog.com/design/5-top-tria-marker-tips-from-geoff-tristram
Great article. Thank you for sharing it.
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