Suggestions for my system

My main goals in hifi are an expansive soundstage in width and depth, and holography.  My system right now is great, Rega has all the PRAT and is energetic to listen to however I feel like it's not the last word in lifelike representation.

Of course with these goals the question becomes one of budget.  Tough to get the "last word in lifelike representation" if constrained by a low budget.

speakers

Looking at a budget of around 5k.  I always search for used stuff on Audiogon so it’s feasible I could nab a component that lists for 10k at my budget. 

It looks like you have a pretty nice setup already.  Have you tried moving the system into a larger space and sitting farther away from the speakers?  You may find that you have more of those qualities you're seeking.  It may be challenging to get that "expansive" experience you're seeking in a small room. 

I have a system set up in a similar sized space - ARC VSI 55 integrated and Focal 1008 BE speakers and an SVS SB12 NSD sub.  It sounds fantastic, very detailed, dynamic, and fun to listen to, but it does not have the same scale and soundstage of my main system which has much larger speakers and more space.  I've tried larger speakers in there like my Klipsch Heresy, but they are too much for that room.  The Heresys sound great in my slightly larger office which also has a much higher ceiling.

Room treatment might also help.  That's something I haven't tried  yet.

You might try adding a small subwoofer.  That should help.

You might be expecting too much from that small space.  Perhaps others that have found a way to achieve the nirvana you're seeking in a small room can chime in.  I don't think replacing your current gear is necessarily the answer.