Career Advice in IT Audit/ IT Consulting

Hi,

I have a bachelors & masters in computer sciences. I am a CISA (Certified Information Systems Auditor), CGEIT (Certified in the Governance of Enterprise IT).

Am currently working with a Big4 firm in IT Audits. I have an overall experience of 5 years.

Am planning to go for CISSP. I am confused whether i should be pursuing CISM or CISSP. Secondly, how would PMP be beneficial for my career?

Regards.