How can I offer custom add to cart options for my products?

[itsangel]

Hello!  I sell a product that comes in a box of 3.  I'd like to provide customers with the option of choosing which 3 items they'd like to put into the box.  Basically something along the lines of what's in the screenshot.  They pick 1 option from each drop down and add to cart.  How do I do that?