What is the best brand of dishwasher to buy (UK)?

I currently have a Zsi but over time various plastic bits have fallen off the internal spray thingies. Presumably this has been caused by heat. Other plastic bits have snapped off therefore I can not adjust the baskets. Very few washes go by when I don't have bits still stuck to so-called washed items. Therefore I am looking for a good quality machine with robust (metal?) internal workings that aren't going to fall off with either heat or wear and tear. Any suggestions