economy dogs Cerbrus

--WJ respected names are being battered by upheaval in the credit markets and economy at large --Cerbrus want ed to renegotiate the $4 bil buyout deal of United Rentals, higher bid than rivals --the ordeal might be a turnabout for Cerbrus. --Cerbrus is a $5.5 bil fund --51% stake of GMAC using $14 bil, which is dragged down by the loss in ResCap, a mortgage unit --Another Morgage firm controlled by Cerbrus, Ageis Mortgage Corp, is underwater. It was ranked 13th among subprime-morgage lenders in U.S.