Most definately the Wabash Cannonball (my first looping coaster) and Chaos for it's extremly unique design.
You can ride the same prototype Vekoma coaster as Chaos at that park in Belgium. It's called the Revolution and is exactly the same as Chaos, only they used a classical music soundtrack instead of a techno soundtrack like Chaos.
These coasters are both still tied as having the longest coaster trains in the world and one of the most revolutionary designs of any coaster in the world!
You can get more info on Chaos at
http://www.access2control.com a super site devoted soley to Chaos! Very cool!
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CoasterTal
Flying over metal is a beautiful thing!