Confused between 60D, 7D and Nikon D7000

Also I want to ask canon users till what ISO setting can i get full poster size printable shots and till what ISO acceptable shots, as in the case of nikon d7000 review of dpreview it clearly says till 6400 ISO the shots are perfectly usable for normal prints or smaller but doesn't specifically say anything about the 7D (in the review).

Also other than better low light stills as visible from the samples of D7000 what other ways its better or worse than a 7D or vice versa.