I used the VK150SEs with the 860x and I got good results with either the Silverline Sonatas or the Dunlavy SC 4s.
The Dunlavys are very good all around performers without really calling attention to any part of the spectrum, not the last word in absolute excitment, but true to the music and very easy to listen to at length. Your room might be a little small for the Dunlavy 4s though.
The Silverline Sonatas are much more exciting with a more 3D sounstage and better imaging, but I was always bothered by a midbass hump and a slightly bright treble in my room. The newest version of the Silverline Sonata might be the ticket.
I did quite a lot of cable testing with this system and found that I liked Acoustic Zen the best. I never did try FMS however.