What should my next upgrade be? Your best experience


I have the itch to upgrade my system now that I've been in it for a moment. I mostly stream (Deezer) or listen to CD/SACD content. I occasionally play vinyl but rarely, I'm sure I will continue to grow into it but am not looking to improve the TT now. I listen to mostly Classic Rock, Jazz, Blues, and Indie music. I'm listening to Talking Heads (live acoustic) as I write this. The Marantz PM-11s3 has zero issues pushing the Monitor Audio Silver 8s, it actually is a little over kill for them I think, as it has complete control of them, never losing its composure.  So there is zero chance the PM-11s3 is up for replacement at this point.
The room is 14'x40' with 12' ceilings. The system has no issue filling every inch and at high volumes so no issue there.

Current system is -

Marantz PM-11s3
Marantz UD7007
Marantz TT-42 
Sonos Connect
Monitor Audio Silver 8's
Analysis Plus Purple Oval 12 bi-wire
Tributaries 8AB XLR (UD7007 to PM-11s3)
Tributaries 2A RCA (Sonos to PM-11s3)
CyberPower Conditioner

The obvious direction, it seems to me, is speakers? But am I missing something? Would upgrading to a real audio quality conditioner with an upgraded power cable give me something more and set me in the right direction for future upgrades? 
Or am I not where I need to be with cables? Can I make a sonic improvement by upgrading speaker cables and/or interconnects while again getting myself in a good position for future upgrades?
I have to admit that this is the best system I've had and I do love every minute of listening to it.... Its fast, accurate, and punchy yet it has great sound stage and its not clinical. It has that Marantz sound/charm (warm but not clouded).
I know posts like this are common and beaten to death but my system is unique as it is mine and probably not exactly like anybody else's...
Never-the-less, I know I'm nowhere near where most of you are! And I know for a fact I have much less knowledge than most of you. I'd like to keep bettering my system, moving towards the personal listening nirvana if you will. So what direction would you head in if you were in my shoes?
264win
If everything sounds fine to you, I would consider the system complete and wouldn't touch it. When you are ready to take the sound to a much higher level you would have to start with speakers or the source and follow up with the rest.
I am in a similar situation with a very different system. I just need to replace one pair of interconnects and maybe two power cords, and that's it for now.
Changing speakers will make the greatest change in the sound of your system but you need to find a pair of speakers that really knock you out.
Since you don't mention a budget it is very hard to recommend anything to you. I personally love Magnepan and Magico speakers
Alan
Thank you Alan and Inna.... I thought as much and will be looking at speakers first I guess?
Budget.... Hmmm, well I guess I could get something out of the Monitor Silver 8s? Though I doubt much. The Silver 8s were 2K and well reviewed. I would want to move into the range of the cost of the PM-11s3 which was 5K...
Your best and biggest change would be speakers. Right now on this site for sale are a pair of Vandersteen Quatro Wood's. At about half-price they are a MAJOR bargain! The seller is asking $5390 and might take less! So check them out!