Silver's a cool mtn, but the main reason we went to Silver, was to ride powder at Peak Adventures Cat skiing, until the state of Idaho decided to not give them a permit to use the terrain that Steve, Terry and Scotty had been using with no problems for 16 years.
That was a yearly trip for us and doubt we'll ever come across a group of cat owners that loved riding powder as much as their customers. Steve left the number of runs up to you and your group. They guaranteed you at least 8, but we consistently were getting between 15 and 20, with no complaints from Steve or Scotty.
Anyways if you plan on staying in Kellogg, look up Kelloggvacationhomes.com, every time we went, we rent one of her houses. They're older homes but at $60-70 a night, hot tubs, sleeping 4-6, full kitchens, privacy (no crowded hotel) and within a mile drive. The last year we went the tram almost went over our roof and we could walk to the base lodge for beer and pizza