I think you are going about this all wrong.
When you talk about Room EQ, notice that the first word is ROOM. I am of the firm unshakable opinion, that Room EQ can make a Good Room better, but it absolutely can not make a Bad Room good.
So, start with the room.
What are the dimensions including ceiling height?
Is this a dedicated Home Cinema room or a general Living room?
Describe the room? What is on the walls? What is on the ceiling? What is on the floors?
Is this an open ultra-modern bare room, or is this an old fashion soft furnished cluttered room?
Have you had the room tested? If you haven't had it tested, and if you can't test it after the EQ is done, who will you know if fixed what needed fixing?
Next, it sounds like you have a 2-Channel system. What Amps are you using now? What are you using for Subwoofer Managment? Do you have electronic Sub management, or just the controls in the Subwoofer itself? What was your procedure for balancing the Subs with the Fronts?
What speakers do you have?
What Subs do you have?
Details ...Details ...Details ...the Devil is always in the details.
I ...just me... would NOT use an AV Receiver for a Stereo System. It seems a waste of money and amps. But ...your money ...your life ...spend it how you will.
I would also not have Subwoofers unless I had Electronic Bass Management to control BOTH the Fronts and Sub.
First let's determine if you have a configuration or Acoustic problem before we go spending money on an unnecessary AV Receiver.
As to all amps sounding the same, the direct experience of MILLIONS of audio listeners know that is simply not true ... but it is not a point worth arguing here.
We can not respond properly without sufficient context, so -
What are the dimension of the room?
Give us a general assessment of the room acoustics? A lot of bare surfaces? Windows? Cutains? Carpet? Any acoustical treatments you already have in the room? Softly furnished? Not ... softly furnished? Acoustical Tile on the ceiling?
What amp/amps do you have on this system?
What speakers do you have?
What sources do you have? CD? SACD? BluRay? Turntable? Network Streaming? Other?
The answer to these questions give us a much fuller framework that allows us to give applicable responses. Without this, any responses are going to be scatter shot.
The fact that you want EQ, tells me that you have EQ problems. In knowing your equipment and room, we can get a sense of specifically what the actual problems and potential solutions are. You can EQ all day long, and if the problem is echo/reverb in the room, you are never going to solve it.
You can't solve a problem, until you actually know what the problem is.
So far people have answered your question, but wouldn't you much prefer that we actually help you solve your problems?
Do what you will, I'm just adding my two cents, and my two cents says you are going about this all wrong.
Still ...as I said ...your money ...your life ...spend it how you will.