You might do some research at Publishers Marketplace.
Here.
It costs $20/month and if you're in the query stage, it is a good investment.
Many print book sales are listed there, along with the agent who made them. PM is particularly useful in separating out the individual agents at the big agencies. Even at good agencies, not all agents are equal.
PM shows who is new and hot and selling stuff NOW. A well-known top agent is a great choice, but she's likely to be a 20-year veteran with a full client list. It may also be worth looking at the Young Turks.