Diesel Combi for long distance (good sound insulation important !)

Hi. I’m looking for a station wagon that can be used to easily drive the highway. I don’t care about the whole thing for a little money (like under 3000). I don’t care about the climate, rain sensor etc. It’s important that the car has a good sound insulation, so there’s not too much to hear from the engine, road, rainplätschern etc. Once had a Citroen C5, which was quieter than anything I’ve ever experienced. A Saxo, Twingo, Kangoo etc, on the other hand, is so loud that you can hardly stand it after several hours. important that the vehicle is reliable (so no Laguna e.g.), and when repairs occur, that they do not become overly expensive (C5 would be bad because of the Hydrative chassis, an A6 would be bad because it has 2 timing belts etc.) I thought about something like an Audi A4 B5, a Golf IV station wagon or a Bora station wagon, maybe a Passat type 3B. Evtl would still be possible Astra G, and a Ford Focus. Oh yes, almost forget: the gearbox should not be translated too short. a Peugeot 806, there was the engine at 120km/h over 3000 rpm !!! So again short: – quiet interior – reliable / cheap or uncomplicated repairs – no short transmission Can someone recommend one to me ? Especially the comparison between Golf, A4 and Passat in terms of sound insulation would interest me sometimes … Thanks already in advance