Dissertations / PhD IT governance - not developed subject suggestion? [7]

Hello,
Im a network engineer and I want to register for a phd but I have some confusion about the selection of the topic.

I have thought of the IT governance which can be divided to those topics:

- IT Strategic Alignment;
- IT Value Delivery;
- IT Risk Management;
- Performance Measurement;
- IT Resource Management.

Can you suggest me what to select for the phd and which subject is not developed enough in research and can be one of the first priorities after 3 or 4 years of research.

Please suggest & give me some advices
Thanks in advance