The 57 is a capable AV that can run those without issue you would not need to go up 2 classes. Buy the 57 and save the additional money for something else.
The only time to buy the 87 would be if you planned on upgrading the speakers and making use of the additional analogue inputs on the back, for example connecting your bluray player via analogue (5.1).
Since you are considering these options, have you thought about other manufacturers like Yamaha and Arcam?