Well as it happens I found a Cintiq 18sx on eBay for an unbelievably good price. Here's hoping it wasn't too unbelievably good, if you know what I mean. I still think I'm an ink-by-brush kind of guy, but I can see all sorts of ways that a draw-on monitor could improve my productivity. And if it doesn't, heck, I'll just sell it. eBay good.