Hey, I wouldn't worry too much about resale value if I were you, lenses are the real investment. If it's your first DSLR I think it's more productive to be in the mindset of: 'Right! this camera will last me for 4/5 years, by which time I'll have shot thousands of images, learned a heck of a lot about photography and know my camera better than my wife'
After you've done that, then it's the time to become a 'gear head', lurking here for snippets of new camera info, complaining about DR etc..
I know when your buying something you want to make the best choice you can, but once you've made that choice fly with it. As for camera advice, I feel the 60D offers the best value at around £600. The 70D will prob come in around £1,000