I'd say you have a pretty hackable keyboard there, Doug. I'd hang onto that one. And I know what you mean about fearing the loss of your device. I'm scared that when my mouse dies, I won't be able to replace it. It's Logitech's Cordless Mouseman Optical. I believe it's their first 4-button cordless optical mouse. Since then, all of their models have the thumb button on the top of the thumb rest instead of the button. This is less ergonomic to me, even though it's a nit-pick. Still, I'm thinking of picking off one of these from ebay. prices off Pricegrabber range between $38 and $70! I got my keyboard for $40!

*edit*
Now that I think about it, Doug, if your keyboard ever broke down, you should worry less about finding a replacement to match its functionality. Just get whichever suits you the best and run Girder. It can monitor keyboard inputs if you enable the correct plugin, and I'm absolutely certain you can do everything you're doing with your keyboard now and much more.