Yes, but quiter ones will probably give a lower airflow making the
computer hotter. You will need to look at your temperatures to make
sure that you wont fry your machine.
It depends which one(s) you're looking at replacing really. Vantec
Stealths seem to be very reliable (I've used an 80mm one). I think
80mm Zalmans are slightly quieter, but are connected to a resistor
(which I think looks a little messy). Papst ones are supposed to be
the quietest, but I've never tried one.
The old, traditional method of reducing fan noise was to simply run
the fan more slowly. This does in fact reduce air flow, and if you
reduce noise a lot then you reduce air flow a lot.
There's a better way: design the fans from the ground up for low
noise. That way you get to keep your air flow, and (not incidentally)
your cool case. ;-)
Ironically, the company that seems to be leading the pack is
Thermaltake, makers of the noisiest HSFs known to mankind. ;-)
Buy a TR2-M3 (aka Thermaltake A4004D). Remove the fan. Throw away
everything that's not a fan. You now have an extremely low-noise 80mm
fan that pushes 32CFM. Need a 52CFM 92mm fan? The Thermaltake A2013.
You might want to invest in fan gaskets to prevent resonances.
Resonances are annoying and have nothing whatever to do with the
quality of the fan itself - it's a sheet metal problem with your case.
If you hear a whine with either of these fans, it's not the fan, it's
a resonance. Touch the fan with your fingertip different places to
see what part is resonating against the sheet metal. Gaskets are
good. ;-)