I'd suggest coolermaster's Blade Master fans, but the black cable and no sleeve bearing requirements kinda kill it.
I'd also suggest a few of these: http://www.newegg.com/Product/Product.aspx?Item=N82E16835706036
But then again they're deltas (WHIRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRR) and on top of that still dont have black cables. On the plus side since they are built to run at high speed for vastly extended periods of time, their bearings are double ball bearings i think.
Actually, try some of these: http://www.newegg.com/Product/Product.aspx?Item=N82E16835426015
They arent ultra high performing, but they fulfill your requirements and should get the job done.