There are two options, one is to softmod (free) the console and the other is to get a hardmod (costs money).
For a softmod you need either an ntsc copy of SSBB or lego indiana jones and an SD card (recommend 1GB for backing up the NAND).
The only hardmod I am aware of which allows USB storage is WODE and wiikey fusion works with SD cards (thought not USB IIRC). Also bear in mind this requires opening the console, although I believe it's just to plug in a ribbon cable between the drive and mobo.
i thought only pal with the 4.3 as region free was disabled?
All consoles running vanilla 4.2/4.3 are region locked, not even a modchip can bypass on these firmware because they check the actual dol file and not just the disc (dol and elf files are the equivalent of exe files on the wii).