look up Hori Turbo 3 controller.
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I just got mine today, and it has every button turbo-customizable, and costs like a regular controller. Also, you can change the speed, and the analog sensitivity. You can have even the start button on turbo! more than one button on turbo, etc. I got mine in red, and haven't regreted anything.
In Cod4 today, i took out a G3 and put the middle speed, made it shoot like an MP5.
Best decision yet...