I don't think you'd be getting good cooling performance from any fan running at such a low RPM, even a Noctua probably couldn't manage that.
Find an RPM that is roughly as quiet as you're able to bare, around the 1000 mark should be that point, the reason yours is loud at that level is probably due to the fan itself. Noise is all subjective though.
Fortunately it's in easy upgrade on the 212 to swap a fan over. A Noctua fan will serve you well and be as quiet as it can while retaining great performance. They're renowned for it.
As for your temps, are you running your 8350 at stock clocks? They're good temps, but you have to keep in mind load level, if the processor was suddenly hit with 100% load across all cores, would a 660rpm fan be able to cut it?
Anyway, the way to change fan speeds can vary somewhat depending on your motherboard. I know that I previously had a budget board that allowed for speed 'levels' to be set in the bios. Even worked with 3-pin fans. Surprisingly this newer, more enthusiast orientated Sabertooth board doesn't hold that feature. Then again, I do have almost all of them plugged in to Molex adapters now.
You can also try some software called SpeedFan, although keep in mind I don't believe it saves them when you reboot, I believe there is a 'open on start up' tick box however.
If your fans are 4-pin PWM, controlling them gets a whole lot easier.
Finally, you could always buy a fan controller. Not huge fan of them myself (Ahuhhuhhuh geddit... no? Aw).