Look for models with adjustable baskets and flexible internal layouts for varying load requirements. For example, a tilting upper basket allows large 30cm diameter plates in the lower basket and extra flaps can be raised or lowered to cater for small items or large pans.

Buy stainless spoons (both slotted and non-slotted) which are solid and won't bend no matter how tough the job. Also, buy several high quality wooden spoons for stirring delicate dishes like risotto (the sharp edge of a metal spoon would cut or bruise the rice).

Don't put up with intrusive machine noise in the kitchen. Most dishwashers are now whisper quiet, 45-49dB being typical. You should still be able to watch the television or hold a conversation whilst the machine is operating.