I admittedly did t read all the comments but if you're looking for soundstage, a lot of that will come from speaker placement in your room. For instance, if you have an amazing center image but not a lot of soundstage width or depth I'm gonna guess that your speakers are 1, too close together, or 2, toed in quite a bit. I was having soundstage depth issues and really spent a lot of time moving my heavy speakers around and found a setup that worked extremely well where I get both soundstage width and depth as well as great imaging. My speakers are pushed to where they're about 18 inches from the side walls and 10 feet apart. I have ZERO toe in. I've had that setup with 3 different preamps at this point and my personal experience is that the 2 6sn7 based preamps sounded better than the 12au7 mu follower design one.
I guess what I'm saying is play with speaker placement. The equipment you have should be more than capable of producing a nice soundstage.