Well, it's actually allowed to take a CDQ for a prestige class before level 10 - matter of fact, it's the only exception to the level 10 rule (though you can participate in others' CDQs if you're under 10th level).
I'd advise going ahead and submitting for the PrC - if you've kept your Dev Thread up to date, and it's not a complex PrC, you might be approved without a CDQ. Then again, you might now.
In advance is good.
