I've thinking of getting an older Radial Arm saw, and they seem to show up regularly on Craigslist. Craftsman and DeWalt are common, and a Rockwell shows up now and then. Most are 10", a few are 8" or 9" and I've seen one that was a 12" wired for 220v. For those of you who have one, what suggestions do you have on what to look for, what to avoid, etc.?