At the risk of being called some kind of heretic, I'll make a suggestion of my own. I've been unhappy with my 2 channel system, swapping out components, all to no avail. I acquired some Paradigm Signature S6 in '09 and had been trying to build a system around them. It was tough, they are forward sounding with that beryllium tweeter.
I tried an Adcom system first, nice but the pre was flaky and would send loud bursts through the system at random. Then I heard about Emotiva and the price was sure right. Bought an XPA amp, ERC-1 cd player and an Anthem TLP-1. I found the TLP to be laid way back and soulless. Replaced it with an Emotiva XDA-1. Now things were too bright with my speakers, and still no soul or synergy/magic. Swapped in an old Denon ave(3803) I had to confirm, it was warmer but no synergy.
Thought I could do better with a disc player and replaced the ERC-1 with an Oppo 95. Better, but still lifeless. I would get sibilance at higher volumes with some tracks(actual distortion in the highs). Decided to dump the Emotiva amp and got a Parasound A21. Big improvement in sound, now I could see what I'd been missing. Sibilance was gone, very nice vocals and tighter/more accurate bass. But still no holographic sound stage, or 3D stage.
Got the XDA-1 out of the system, and plugged the Oppo straight into the amp. Better, but I experienced some volume limitations which made me want a dedicated pre. Got a NAD C372(integrated from 6 years ago) and used it as a pre. Better volume interaction, but still no soundstage magic. I got tired of swapping components, and was ready to throw in the towel, maybe i was just not spending enough and I'm not prepared to spend 2-3000 per component just to get some magic in the sound.
Then I was reading and this poster I trust on another forum mentioned to someone else how changing his speaker cables to Audioquest Type 4 had made a significant improvement, and he now swore by them. I did some research, and found results and mockery all over the net. Zeroed in on the Type 4 and found it's a solid core wire design with bigger gauge for the bass and smaller for the highs woven in a type of litz design with some other design specifics. I tried them, replacing some 12 gauge fine stranded OFC wire.
The difference was immediate and not subtle. It was like the music was somewhat out of focus before, not that i'd noticed it. But there was also more detail. And this sharpened up the soundstage. I could now localize instruments much better and even some on the left side of the left speaker, meaning I guess that the soundstage widened. It was an eye opener for me.
Mind you, I had better than run of the mill IC's that I'd acquired along the way, not sure if they helped. Bottom line, with all of the component changing you are doing, I haven't heard anyone mention if the cables might have a part to play. I'd humbly suggest buying some Audioquest Type 4 if you've never tried speaker cable upgrades. You can get in on the cheap, buying it by the foot at some of the on line dealers.
Might save you some green over more component upgrades.