IT Department Organizational Structure

We are a fairly large IT Department – over 200 people.

We have currently, functions like-

Software design & development
Infrastructure managemement
DBA
System Admins
Training
Information Security
Project management
Operations (Data Processing)
Business Analysis
Testers
Quality Assurance
Support

What would be the best org. structure of this dept.; The designations and the job roles, that fits well with the current industry practices.