The MRI outlets will not be any better than the Hubbel outlets. Most likely they will be made from the same type of brass material. Hospital equipment has a much different set of requirements than audio electronics. My suggestion would be to use your existing Hubbel outlets for now. Maybe move up to the cryoed Porter Ports if you feel the need. Above that, it gets very expensive with Furutech,and other brand when looking at gold/rhodium plated copper or phosphor bronze.
MRI grade vs Hospital grade electric outlets
I know both have been suggested as an upgrade to the run of the mill cheap outlets. I also know there may be "even better" outlets. I know the MRI grade has non magnetic metal components. Bottom line, does it make a difference one can hear? I have about 1/2 dozen Hubbell 30 Watt hospital grade outlets. Got them fairly inexpensively. Are the MRI grade worth the extra $$$?