Konami sells arcade controllers. They are quite expensive ($450) but feel just like the arcade.

There is also a cheaper version.

These are known for getting "sticky" keys after a while. There is a simple mod requiring you to shave the plastic off the buttons.
Both have an interchangable feature in case you ever bought 2 of them or would rather spin with you right hand.
Oh and there is also a Pop N Music ASC controller($450) out there in case anyone wants one.

I know what you mean about it being additive. I have all Beatmania IIDX's, almost all the DDR's, and I do have all the Pop N Music. God bless the Japanese.