I had a 60D and I really like it. I'm buying a 50D as a backup for AFMA purposes and because I don't need a video, and I'm not sure if I would be tempted to get a 70D. Let's say in 3 years I find a really nice package with lenses and printers and I sell it all off so the 70D body only costs $300... yes it would be a nice addition, but I don't know that I would want it as a backup. It is better... but I almost would opt for a 7D as the next logical backup option.
As a quick aside... I think is a very suitable replacement to the 60D. It doesn't have everything, but it is definitely worth making the upgrade from the tXi line... in my opinion at least.