We purchased a Maytag mid-grade unit at Home Depot at substantial discount when they offered a special sale a few years ago.
Three things were required:
Quiet as possible
Top rack needs to have one side deeper than the other
Dual cleaning, one spinner on top, one on the bottom.
Get a mid-grade unit with as much silencer as you can afford. The loud ones cleaned only OK, this unit, model "Quiet Series 300", cleans much better.
It also has a deeper side to the 2nd rack so tall things fit on one side in the 'loft' area and it has dual cleaning spinners, one on top & one on the bottom. So far, this has been a solid unit.
Lastly, my sister bought a Bosch unit for 2-3x the price many years ago, she's had two repairs to it, but it does a fantastic job cleaning and is whisper quiet.