K, so which board do you have. I'm just a little curious why you need more headers. I've got 2 headers on my board, and 2 front USB ports. The connectors from BOTH those ports can hook up to 1 header, leaving one more. I have a card reader hooked up to the second header (4 of the 8 pins) leaving room for one more potential usb device. I'm not sure why this wouldn't work for you, as most boards I've seen with 2 headers have this setup. Like this (each dot is a pin):
. . . . One front USB port
. . . . Second front USB port
. . . . Card reader
. . . . Unused
There may be an extra pin depending on the setup, but these are the ones that are used.
Also, I highly recommend the 3.5" Mitsumi 7-in-1 card reader + floppy. It's pretty cheap, takes the place of your floppy drive (has a floppy disk reader), as well as the multi-card reader...very cool little device. Runs off IDE (for floppy) and USB2.0 for the card readers.