CERT and ISO 27001

Hi, I'm searching a service/company doing continuos review of security alerts for various tools, software and hardware (Apache, PHP, Cisco IOS, Juniper JunOS, Netapp Ontap, etc ...). I think the right way is to use a CERT offering commercial services with daily notifications about a list of specifics choosen subjects. I found some companies with a commercial CERT offering this services: Lexsi, XMCO, Intrinsec. Do you know or use a service link this ? We need this for our implementation of ISO 27001 standard. Thank you in advance. Regards, -- Guillaume