Some of the firms that might be interested in you:
Corporate Executive Board
McKinsey Global Institute (research wing of the consultancy)
Booz Allen Hamilton - government/IT practice
PA Consulting - government/IT infrastructure practice (I forget the correct name, but it'll be on their website. They are also big in Scandinavia, which may be useful if your screen name is an indication of where you currently reside.)
Capita Advisory Services
IBM Business Consulting Services (they are big on producing research, white papers, thoughtpieces, etc. in parallel with their consulting)
The best-fit firm for you will depend on what balance you are looking for between leveraging your research skills (i.e. going in as an experienced hire) and developing a consulting skillset (i.e. potentially going in at a more junior level than you currently enjoy).