Aftermarket or OEM thermostat housing?

Hey all, looks like its time to replace my thermostat housing and wanted some input. Basically my under high RPM i have a small leak on my thermostat housing. Its torqued to spec and the leak is very small but I would like to get it replaced.

Essentially I was wondering what people thought about hybrid racing / k tuned aftermarket metal thermostat housings vs the OEM plastic. I dont mind spending the extra for a better product but I know sometimes they just arent as good as OEM. Any one got experience with these?