Depends on the application. When it comes to forced induction heat is your enemy, and although a slower warm up is likely there are many benefits to the cooler temps.
This is where an electric water pump and pwm fan/water pump controller come in handy. The pwm controller will control fan and pump speeds to ensure quick warm up and steady coolant temps.
Thermostat housing question....The T-Stat i have moves inside in the housing Is there supposed to be a o-ring...There is nothing clamping down on the t-stat
Yes, you need to have the O ring for the type of thermostat, the seal/ oring usually comes with the thermostat from most auto part stores.