A group of hospitals suing Horizon Blue Cross Blue Shield of New Jersey for excluding them from a new line of discount health plans claims they have proof the insurance giant based its decision not on quality or cost, despite its marketing claims. Horizon selected the largest hospital chains when it assembled the OMNIA tier 1 network to force "the most expensive network hospitals to moderate their prices," according to the latest version of the lawsuit, filed last week in state Superior Court in Bergen County.