GET THE CASTERS! GET THE CASTERS!
That said, I've returned for a look at your Synergy. I may be closer to deciding on one of them for myself (despite the size challenges), though likely the a la carte version since it's not as heavy plus that style will better go with the Sanus Euros already in place here.
I know you don't use the rear panels that come with the Synergy, but do they accommodate the cords coming out those back slots pretty well?
VPI, Grado, SME, Pioneer Elite, Magnum Dynalab, Oppo, DVDO, McIntosh, JJ, Mirage, Kimber, Transparent, MIT, Pangea, Wireworld, Shunyata, PS Audio, Furman, Sanus