I don't have an answer for you but I sympathize. It's a terrible catch-22; you have to have an agent to get published but you have to be published to get an agent. I guess persistance is the only solution. Eventually, someone has to actually read your work and decide it's worthy. Assuming, of course, that it is worthy.
And I suppose this right here is helping. Any literary agents, editors, or publishers reading this might decide to take a stand and take a chance. I like to think of all the classic, timeless novels that were turned down flat a hundred times before finally being published. I save all my rejection slips with the hopes of being able to call up those agents and publishing houses once I have a book on the best sellers list. A book they turned down. Silly and immature, I know, but it makes me feel better.