Thanks James, Jim, & Dave!
I think if I want to do any post processing beyond moving sliders, I'm going to want a tablet. I've decided to try Wacom's $99.00 Bamboo Fun model to get started with. Depending on how well I'm able to navigate with it, I'll know whether I can do with an Intuos, or if I'll need to start saving up for the Cintiq. I've got lousy hand-eye coordination, though, so it looks like I better start saving.