Although we did stay in the 60's when we were there, IMHO, the 50's would have been just as good, if not better. You're still close to the food court and buses, but you actually have a shorter walk to your car! The 70's would be another desirable building - I think the only disadvantage is that the 70s parking lot is small and fills quickly - so if you have a car, that might be a little inconvenient.
The resort itself is FABULOUS - bring your camera as you walk the grounds - the icons are great!
Laura