I'm thinking mostly out and back layout.
First of all, the key is to have low to the ground sections with airtime and pure speed. This is what makes Hades great:
http://www.themeparkreview.com/coastert ... d=hadespov
And of course, the American Eagle (very accurate recreation):
http://www.youtube.com/watch?v=70P4lVa0 ... sCjraw-H84