In my opinion, I think HealthCenter.com would be a great spot for an internet health portal - ie, the "health center." For me, I believe the plural has tons of value because it can be used as a resource to find and select "health centers" - ie brick and mortar health centers. People can locate a health center in their area and see what services are offered. This would provide a great advertising revenue opportunity when developed fully. Personally, I agree that high $x,xxx to low $xx,xxx is probably a good reseller price, but with some development, this could be mid $xx,xxx easily, imo.
This name hasn't been developed in years, but as of today, is receiving around 10 uniques a day.