Upgradeitis

I have Kef Ref 5's 

Dcs Bartok

PS Audio BHK 300 monos.

Rel S812 subs x 2

I know how good your Kefs are and to upgrade them is going to take some serious dough. Why don't you consider a couple of subs, that's what I did and I couldn't be happier. It is a huge upgrade imo at a fraction of the cost. The overall impact on sound is quite surprising and very rewarding.

I went from KEF Reference 1 speakers to Yamaha NS-5000 and really enjoyed the upgrade.  Qualio's IQ is really nice if you want to try open baffle.

@crwindy 

I'm curious:  what did you think of the Vivid Audio oval?  It's strengths and weaknesses?

That was the first, earlier model Vivid speaker I encountered and they've clearly moved on in their cabinet designs.

I liked the ovals. The mids and highs were excellent. They did not quite fill the room as much as I wanted, even with a JL subwoofer. 

I'm on a similar upgrade path with a similar sized room.  I'm using a venerable KEF speaker from the '90's, the KEF Reference 107. I'm the original owner. They have been upgraded with better crossover parts and new internal wiring.  I have struggled to find anything I like much better without spending a fortune, so I will be interested in responses. The rest of my system is CODA 16 amp, CODA 07X preamp, Playback Design Merlot DAC, (Upgrading to Playback Design MPD-6 soon), Innuos Statement streamer, and a stereo pair of REL S510's. . I find the KEF and CODA gear to be a really compelling combination! I would echo the comment about considering adding subs to your setup. You will like what they do to the soundstage and it's NOT about more bass.