I bought the cheapest I could find in a reputable DIY store, not being willing to pay for a new Siemens. It works well, four years later.
Choose one that weighs the clothes and adjusts the amount of water to suit. This means you don't have to fill the machine up to wash economically.
Mine has this feature, and a very short cycle programme that can be adjusted from cold to 90 degrees centigrade, as well as the normal cycles, which I literally never use.
Being able to adjust the force it spins clothes at is a helpful feature as well.
Anger management!!! Help needed.