idk about the USB but try the saitek eclipse on newegg. the eclipse 1 has blue keys, eclipse 2 is red. and eclipse 3 has interchangeable colors i think.
those are some tough requirements. most of the ones that have audio in/out are not backlit.
the Razer Tarantula has the audio and usb ports. the keys are not backlit but they have a "battlelight" that illuminates the keyboard in blue
there is also the Steelseries Merc Stealth which has everything you are looking for (including back-lit keys) but looks kinda odd (it has good reviews though)