Careful,
An AVRs bloated power rating, doesn't compare to the power of a real Amp. Heck most AVRs weigh less than your typical 2 channel Amp. Of proper power.


As for room correction both A.R.C. and Dirac are what to go for at the moment. Dirac supposedly has more custom settings or needs more REW type experience.
Where as A.R.C. you can run and leave with great success. Mind you if you'd like to go REW with A.R.C. you can easily access any part of settings you'd like.