So I'm looking to throw a new thermostat in my 12 valve, does anyone know of any brands I should or should not buy? I thought about just going to get what ever replacement autozone had stocked but I was told I need to do my research and make sure I buy a good one.. Does anyone have any suggestions?

Another thing, when I google thermostats I see these thermostats by Cummins that come up for $49 but on rock auto I can get one, for example Gates makes one for $12, autozone told me theirs was $9 and the gasket was $2 or something, I never asked what brand it was. I'm a little confused as to what I should be even looking for.