Fishwater -
There is a pair of used Coincident Partial Eclipses on Audiogon now. The higher efficiency of these speakers would give you plenty of headroom, and I think you'll find them to be articulate and nicely voiced. I can't say for sure they'll image better than the Vandies (which are very good in this respect). But their 92 dB efficiency compares very favorably with the 86 dB efficiency of the Vandies. To put it into perspective, you'd need FOUR TIMES the amplifier power to drive the Vandies to the levels your McCormack will drive the Coincidents.
Duke
There is a pair of used Coincident Partial Eclipses on Audiogon now. The higher efficiency of these speakers would give you plenty of headroom, and I think you'll find them to be articulate and nicely voiced. I can't say for sure they'll image better than the Vandies (which are very good in this respect). But their 92 dB efficiency compares very favorably with the 86 dB efficiency of the Vandies. To put it into perspective, you'd need FOUR TIMES the amplifier power to drive the Vandies to the levels your McCormack will drive the Coincidents.
Duke