Well I can certainly recommend a Mafell LO50E as the quietest router I have ever heard. They are made in the same factory as the Festool - so you may wish to consider them if you have a really deep pocket. I have an age old review from either F&CM or GWW (can't remember) and they noted it's very low noise. It also has no vibration, and is the first router I have ever used to be so well balanced. It seems to have plenty of grunt, and the "pistol" grip makes it much easier to do freehand, or fence work, although it's not so much benefit in a table.
Adam
PS: So far, I've used DeWalt, Bosch, Makita, Trend and a few others, and they are not a stitch. I can easily use the Mafell without ear defenders, which is not something I would normally consider.