I can tell you what tire ISNT quiet: Vredestian ultrac vortii+. My winter tires are quieter than this!
As far as soundproofing, you can probably go with anything. I use STP (Standartplast). I've done my door panels on my old one but haven't gotten around to doing this car yet and probably wont till summer. I use 3 layers. STP silver for vibration absorption, STP aero 6 for thermal insulation and some generic sound absorption foam for the door inner panels. The first 2 go on the door outer panels.
Since I've only done the doors, not the entire car, cant say if it really makes a sound difference, but what it does is reduce vibrations by a ton. Like before if I had my speakers on medium, all the exterior panels, interior panels, mirror covers would vibrate. After? almost no vibrations. This car has an amp and a 10 speaker audio package so it's a lot worse. I can hear the door panel rattling when it touches the window glass.
