Assuming you are referring to cats with the highest EPC, this is what works for me:
Education & Career > Education
Financial Services > Credit, Loans and Debt
Telecommunications and Internet Service Providers > Telecommunications (this one fluxuates)
I started going through each category and placing one on each sub-page but never got through the entire list to come to any solid conclusions.
Basically any of the traditional big spenders work well (Finance, Real Estate, Telcomm, etc.)