I need a good quality high flow water pump for my Small Chevy. Summit has many by various brands including their house brand (imported). I want aluminum, but which too choose?

Flow Kooler makes the claim that theirs outflows all other pumps, but I'm not so sure I can believe that.

Despite the arguements back and forth, I am looking for max flow at all rpms (especially at low rpm, but at all rpms when possible).

Also, Same question for T stats. I want a high flow fail-safe Tstat. So many though. Any opinions?