Why these fans in particular? There are many different bearing designs out and typically it is not bearing noise that is dominant in good quality fans. Neither the Sunon fans nor Enermax fans you refer to are exactly the best known for silence and you will not find them ready fitted to quiet cases.
A better bet would be more commonly known quiet fans that are ready fitted to some cases or can be bought for fitment to any case:http://www.silentpcreview.com/Recommended_Fans
Well, everything I've read so far suggests maglev fans outlast, outperform, are more quiet (at full speed), and don't really need a speed controller....that said, my research is not far along. I've printed out the linked article above, will have to study it a few days, and likely google the stuff it says a few more days, as I'm big on fact-checking.
By the way, I never found any mention of Enermax or Sunon selling maglev...all the 120mm ones I've found so far are are generic or unknown brands. Anyway, thanks for the link!