After a quick glance, that does seem to be the going price on the classifieds.
The biggest matching issue is the center speaker. If set on these ML's, I would in fact try with no center speaker, but running as phantom. The mismatch up front is most likely too much. But, YMMV.
Please note that 'stats love to have significant distance from the front wall, and any efforts to treat this front wall will pay immediate dividends. They also may or may not present a pretty difficult load, as a random guess, since these do not have the built in ICE amps that the Vantages/Summits get to enjoy.