Easiest way is just to volt mod the fans to run at either 7 or 5v instead of 12v. Take a molex splitter and switch the yellow and red wires on the ends. Make sure you mark the connector so that you don't accidently try to plug anything else into them.
Then take heat measurements, if it stays within range, your good.
I'd replace the PS fan with a panaflo low speed, or just replace the whole PS with a silent model.
If you have spaces for 120mm fans, use them instead of 80mm ones. If not, you may still be able to replace them with use of fan adaptors.
If your cpu get two hot, look into ducting the air onto it. If it's your video card fan, there's a few good silent replacement cooling solutions out there for video cards. I believe I bought one for my old 9800 pro over at either SVC or Directron.
I've been in your position before.
Also, if your case has decent airflow, you may be able to do without some of those fans simply by upgrading your heatsink and using thermal paste correctly. A good heatsink, installed correctly, beats additional case fans. It may even be possible to go completely fanless!
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