I understand that all the on-shore dishwashers are made by 3 companies. There are good dishwashers that will do a good job for very little money, trouble is, they are noisy and don't have as many bells and whistles.
Only you can decide what you want it to do; wash the dishes, have 8 or 10 cycles, be extremely quiet, be covered with 24k gold. Once you decide what you really want, just remember, the more bells and whistles the more cost. They appear to range from $250 up to $600.