I have a 60D and a 60Da, the 60Da slays the 60D but up untill i got the 60Da i was very happy with the 60D and if i lost my Da would definitely be staying with the 60D. If i couldnt get another 60Da that is
The rotating screen is super handy if its hanging of the back of a scope low to the ground. Also i found it really easy to contol the camera with the free software on my mac for long remote exposures. Also the live view, through to my computer works well. I was using a nikon D7000 before the 60D btw.
<i should add though i have only been playing in this sandpit for about a year now so still learning a lot about gear myself>