I have considered doing this actually. Hard to tell what USB cables are quality or just the same garbage you already have.
What are you using now if not risers? Onda boards? Sell me one? hehe
These are the ones I always used:
http://amzn.to/2BMxYAtThey aren't the cheapest, but they're not bad and super reliable - I don't think I had a single one not work. For my last build 3ft was the ideal length, but they sell smaller ones that might be better for most people.
I've tried all those - Colorful, Onda, etc... TBH I love them all, you really can't go wrong with any of them, even some of the weaker ones.