A:Answerbecause of new models AVR10 which is now offers for $2499. this is better than the brands you suggested due to DIRAC calibration. it is less on features and better on sound.
A:AnswerIf you want to do a 7.1.4 system you will need to add another two Chanel amp. The receiver is set up to add the needed equipment. I do not have an ATMOS system. You CAN however do a 5.1.2 without adding another amp.