Any decent receiver will work fine however if you know you really want the Emotiva amp then you might as well get it now since you’ll just be getting it later anyway. Since, due to technology advancing, you’ll probably be upgrading the processing side sooner than the power side why pay for more processor than you need only to later buy the amp you want.
Sorry I can’t give any recommendations on what receiver to get since I haven’t been looking at them for a couple years, but any major name brand should get the job done fine. You might want to post your budget and even start a separate thread on what receiver or receiver/amp combo to buy since the title of this thread may not catch the attention of those who know about the electronics. Whatever you do keeping in mind that having an upgrade path in mind can pay dividends down the road especially when you start moving walls.
Cheers,
Dean