I want for a nice diff tool on Mac that doesn’t cost an arm and a leg like Kaleidoscope. Right now I am using one called CompareMerge2 from the App Store which is pretty good.
(I don't expect you to say "great idea, sir, here's your coupon!". I'm sure you've done your analysis and you're at the price point that works best for you. I'm also not saying it's overpriced, just that it's more than I'm willing to pay for it given the functionality I want from it. This is just in the spirit of friendly user feedback.)