Looks like it dips just a tad below 5 ohms at 40 hz, and another dip to 3.5 ohms at 160 hz. At 100 hz, impedance is 4 ohms with a -40 degree phase swing. They may be sensitive, but they are NOT an easy load.
So don't drive them with a bridged amp or you will risk letting the magic smoke out per the manual.
More than a few owners use Vincent amps per the forums and I have a friend that has a pair that runs high powered amps with them as well. These are not the same as the Heritage line and seem more for home theatre where a sub is doing the heavy lifting.
The op asked for an amp with similar grunt and bass weight as the c375 with more refinement....that is an accurate description of the Vincent sound.