I consider web safe colors a thing of the past, TBH. Yes, each monitor will look a bit different, but they seem to handle a wide range of colors well enough.
Well, there's your problem really. You shouldn't be doing that anyway, as it's more than just which screen this is viewed on. Even on a nice Mac screen, many people will find that hard to read and inaccessible. The safest thing to do is make text, colors etc. clearly distinguished and easy to view, and let go of some of these graphic designer fetishes that make for such an inaccessible web. I don't think many, if any, site visitors care much about the design, as long as the content is easy to find and digest.