OE-quality thermostats from OE-manufacturers offer good value for money when the only difference is the presence of the car manufacturer logo. f.ex. the BMW M54 thermostat is made by Beru, which is the brand offered for this engine here too.
Tip: You can leave the text input empty and use the brand and/or type selectors to show every matching product.
Mishimoto racing thermostats have a cooler opening temperature ideal for summer-only and track use.