What is a good all around high quality speaker to purchase?

Vandersteen, Monitor Audio, MOFI are all good all-rounders.

I have a pair of piano black KEF Blade Ones I might sell.  Contact me if interested.

I have three completely different recommendations, each capable of outstanding sound quality, but each approaches that very differently.

+1 for Monitor Audio. The Silver 500 7G ($3400/pr) is simply the finest speaker available under $5000 per pair. Check its presence on the Stereophile Class A List. The reviewer  saw the price and thought that it was per speaker, not per pair. My first thoughts on hearing them was "This is what JBLs SHOULD sound like." Clean, tight, dynamic with good bass extension, soundfield and imaging are very good, with no muddiness, nasality or harshness on male or female vocals. Instrumental attack on piano and acoustical guitar are first rate. The dual rear ports allow easy room tuning in the bass. They do like to be 3-4 ft away from walls, as do most 2X8 floor standers. If they aren't enough, you can move up to the Gold series which steps up the basic config, swapping in a ribbon tweeter and more sophisticated driver and cabinet builds and an incredible Macassar veneer cabinet option for $7500/pr. 

Of course everyone should own a pair of Magnepans at some point in their audio journey, A pair of 1.7is and a pair of REL T/9X subwoofers would fill your room nicely given an amp with 100-200W/ch that likes 4 Ohm loads. And it looks like you have that already covered. Like all dipoles they really need to be out away from the rear walls and corners. Observing that rule, the immensity of the soundfield they can generate simply can't be done with a box. Any qualms about bass are easily handled by the RELs. 

Finally, KEF LS-60. A phenomenal all-in-one speaker/amp/streamer system. Just plug and play. With 700Watts of triamplified power per speaker, KEF has done a stunning job in an impossibly slim cabinet. Just stream using your favorite source using your phone as a controller, or buy an inexpensive Android tablet and dedicate it to that task. Need more bass? KEF offers the matching KC-92 twin 9" sub with 1000 Watts of power. If listening is more important than tweaking with your gear, this is the way to go. 

The nicest part is any of these can be had for less than $10,000. 

I’ve owned and would recommend Devore, Proac, Verity, Harbeth, Reynaud to your mix. Owned a bunch of others many years ago like Vandersteen original 5, but they are out dated in sound for the practicality of owning them (extremely heavy). Old Wilson and Magico and B&W same category but if that older sound doesn’t matter, there is value there. Others like modern Klipsch are okay but they have the rigidity of a bathroom vanity from Home Depot if that matter. which it does.

I always suggest finding the kind of amp you can listen to over time and the speaker equal or second in some cases. Learn about efficiency and impedance curve to hone in on the amp and sound.

Again, most newer speaker manufacturers will have more live sound as they all come out with new products. If you haven't heard they buy something older, be happy.

i owned in the past Kef Ls50 which i believe are good bookshelf  speakers and I also heard the Mofi source point 888 for floor stander. price points are entry level and great sound.