Seeking more 3d imaging, deeper/wider soundstage


I'm considering replacing either my amp or my pre. My system is profiled in my system link. Which do you think would improve soundstage/imaging more:
Replace the P3? I'd consider used McCormack, or a passive line stage, but my amp clips at 5v, which is what my DAC puts out when using the XLR outputs, and I'd like to try those someday...not sure a passive is a good fit for my system? Plus I require a remote. That's a deal breaker.
Replace the Rotel RB-1080? I'd consider parasound (a21 is a bit too pricey for me), used McCormack, odyssey, maybe even older krell or classe. I want XLR inputs tho.
Budget is $900-$1200 for either. Music spans the full gamut, excluding hip hop and country. Room is small, 12x12x8. I'm going to throw up some affordable foam acoustic absorption this summer (foam factory). Thnx in advance.
realremo
I'm not familiar with the specifics on the Quads, but 89dB and 6 Ohm nominal does not sound like a difficult load for, say, a 100 Watt push-pull tube amp (using the 4 Ohm tap). Do the Quads have some wild impedance swings that make them unsuited even for push-pull amps?
It is not extrme difficult to drive, but it is not that high either. It is not the fastest in response. That is why you need speed to get a more controlled low freq.
Two things I would suggest.

Spread the speakers a little further apart, you have more real estate there to play with.

Consider the purchase of a good tube amp. This alone will give you more body and 3 dimensional sound over the Rotel amp.

Shakey
Don't know about Rotel but the brands Bo identified are certainly NOT all inherently 2-dimensional as indicated. I have heard otherwise.
Because your room is square, standing waves will *always* be a problem as long as you place the speakers "conventionally" along either wall. If I were you, I would experiment with placing the speakers diagonally in the room, where the speakers would flank a room corner.

And you might consider toeing the speakers in the same direction so as to be firing the sound to the right as you look at the speakers. Doing so will help to eliminate early reflection points which tend to "smear" the sound and reduce the 3D effect.

Bass traps in the corners would also probably be a good idea. This will help you eliminate bass frequencies that tend to load up in the corners...