Panaflow's with the hydrowave bearing are high quality and used in workstations and servers, generally more expensive the bearings have a MTBF of 120,000 hours. At higher rpms the bearings reduce overall fan noise 2-3 dBA.
They have a nice low noise series, FBL I think is the model prefix and they can be bought through Digi-key
NMB's are I think rated for 70,000 hours - both are quality fans better than the SUNONs and YSTECH and Delta in terms of overall Quality can not go wrong with either