Charbo, i can suggest some quiet fans. Just remember that quiet, means less cooling. You can get 1 120mm fan, that can do the work of 2-3 120mm fans. Also, where will these 120mm fans be?For a important suggestion, their are really 2 things about great air cooling. One, is the size and speed of the fan. Second, is the place/position of the fan.
But since you want a silent system. Then you absolutely have to place those fans in the best positions. This is because you will have fans pushing alot less air. Thats what silent is. So in order for you to work with that, you must position them well. Weak fans must be on target. I suggest puting a high-out put fan on your removable side panel, blowing air striaght at your cpu/mobo. Then just use silent fans. With the acception of that high out-put fan, you would really be droping those temps.
Here is the high out-put fan. This fan would really decrease your temps. On your removable side panel.
For your silent fans, i suggest the Vantec Stealth's.