Forgot to vote in the last two rounds, oops!
This is a tough group though. I've been on The Ultimate, Stealth and Euro-Mir but not the others. iSpeed gets my first vote, these Intamin launch coasters are generally top notch. Then, and I didn't think I would ever say this, I am giving my second vote to The Ultimate. I really enjoyed riding it earlier this year.
EDIT:
How is Slealth beating iSpeed!?!?