You probably don't want anything that will be in the way(ex. too thick). For a current that's equal or less than 2A/5V you just need something that you feel comfortable to handle (and easy to solder)
When I did the Thinkpad 240x/240 built-in usb hub mod, I used CAT5 Ethernet cable wires.
When I put a SD reader on WRT54GL, I used USB cable wires.
When I added two extra USB ports onto NSLU2, I used floppy cable wires. I used the same type wires for Wii chip mod (yaosm) and I guess there are a lot of floppy or IDE cable supply at the electronic/computer recycling place now because nobody use those cables any more.
However if you are doing something like stacking memory modules kind of mod, you probably want much thinner wires or even with solder only.
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