If your looking for PWM (which the S-Flex are not) I would suggest the Kama PWM fan, has the same bearing at the S-Flex and at 8 bucks a pop, not to badly priced.
Do you have a source for that bearing info? The specs at the Scythe website list the Kama PWM as having a plain old sleeve bearing, whereas the S-Flex has the S-FDB fluid bearing. Not that there's anything wrong with a quality sleeve bearing fan necessarily.