I have not heard the Cary, but have heard the other two. The RM9 is so much better than the VAC, it's almost funny. While I agree with Clio somewhat about the neutrality of the MR, when used with EL34s, it does have that midrange magic you seek. The VAC reminded me of SS, and not the (few) good SS amps out there.
RM9 gets my vote.
Shakey
RM9 gets my vote.
Shakey