Yeah, the bigger the rack case the better if you want it quiet. I got 4U cases so I could use normal tower coolers with 90mm fans. Stuff like this (120€ for ATX PSU, up to EATX mainboards, 11 3,5" slots upgradable to 15x 3,5" slots) or this (60€, for ATX PSU, up to ATX mainboards, 8x 3,5" slots upgradable to 13x 3,5" slots) are nice and quiet if you replace the stock fans with quiet ones. And both cases got dust filters. Not the best quality but good value and very durable. Supermicro got alot of great server mainboards that use normal ATX and EATX form factors. Everything that will fit in a normal consumer midi tower case should fit there too. So a lot of options for quiet hardware.Good luck with that, 1U means 40mm fans, for 120mm you'll need at least 3U.
With replaced fans these are more quiet than my gaming pc.
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