Ibiased (see link below) but my experience leads me to recommend considering smaller consulting firms and their relative advantages, especially if you are making a transition from IB to Consulting.
At small firms the career path is more entrepreneurial, and a little riskier than working for a larger brand, but the potential is there for extremely fast-tracked career growth. Small shops are specialized, and some of these specialties (e.g. financial analytics) make better use of existing skills you you gained as an investment banker.
-Jaime @ Fitzgerald Analytics: Ranked by Consulting Magazine in 2010 as one of the Best Small Consulting Firms to Work For.
Hope this was helpful. Happy to help anyone with questions or interest in this area.