Another nice one is the Omni Bedford Springs resort. It has golf, a pool, a really great spa and just really nice grounds in general. It is right off the turnpike, and you would go past Johnstown to get there, so you could easily drop off the older kids.
Nemacolin is a little nicer than Bedford Springs, but I think Bedford is less expensive, on the way to where your kids need to go, and is very very nice.
Do you want active or relaxation? Seven Springs is is more active, as are Deep Creek and Wisp, whereas Nemacolin and Bedford Springs are more about ultimate relaxation. If it were me, and I'm going somewhere without my kids, I want relaxation, which is why I'd recommend Nemacolin or Bedford Springs over the others.