Batman (MD). It's Sunsoft, what else can you say.
Yousuke Yasui is another great example of how to do 1st stage themes, like he did
Eschatos.
Simon Belmont's theme has to be one of the best things Konami has ever put out. I still struggle to fully handle its epicness every time I listen to it.
But like jdkluv already said, Namiki is one of the top masters in this field, with an almost perfect track record.
Seriously.
Actually I have many more favorites, but it's getting late, these will do for now.
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My old Stepmania simfiles:
here and
here
MAH BOI, this peace is what all true warriors strive for!!