good speaker with Sound stage behind????

Quad 21 L2
Totem Sttaf
aperion audio Intimus 6T (Internet vendor)

These all sound very nice for around $1500 and wont be quite as in your face as the Monitor Audios. Stay away from metal tweeters if you are struggling with the RS8's treble. Good luck.

You need to find a very rare Tannoy.
It is considered the last of the "gold" monitors . They are coaxial and not really monitors they are about the size of a Klipsch Heresy sort of large. They are called DCN-200s E-mail me for a source -they are very hard to find.
The main point is not staging with these, but tone. A very very English tone warm and non fatguiging. You can always add a Tannoy super tweeter if they are a little to fuzzy for you.
THe other speaker That I for it's incredible staging is the Von Shcweickert VR2s. I use them myself in my WAF sytem. They will make you budget used. When new they were last about $3,000. All soft cone and dome with an adjustable level, rear firing Tweeter/Mid. The other great aspect about them is that despite double woofer mid woofers. they never drop their impedance so I used a small tube amp to drive them. It gives you that option. I believe they were recently discontinued. You might find a dealer with some leftover "close out" stock. Check The VSA site.

Vandersteen speakers are VERY well known to have their soundstage presented more in "the back" (and some would say Vandys are a bit "to laid back").