I Need Your Advice

Many of you know that I am seeking an agent with my YA novel, The Ultimate Evil. However, I'm wondering if that's my best course of action.

Huh?

You see, there's been a lot on the web lately about agents and editors wanting (needing!) middle grade fiction. I have my two completed MG novels, Khaladin and Help! My Parents Are From Outer Space! What I'm wondering is this: do you think I should query those ten other agents I found for The Ultimate Evil, or do you think it'd be a better decision to wait on that novel and pick one of the other two to pitch?

Speaking of pitching these novels, there's a poll in the sidebar of my blog about which MG story I should pitch. Even if you already told me your opinion several posts ago, please vote over there. It's an easier way for me to keep count. :)