Forum Moderators: open
I wouldn't recommend moving your million keywords to Overture - especially since you are justing testing it out. What are you going to do if Overture blows $500 of your money with no sales?
Upload your best converting (or high traffic) Google keywords into Overture and see the results. Adjust the bid prices. Compare the conversion rates of Google & Overture. And then move those 100,000 keywords into Overture.