Cooling my new engine; H2O pump, rad?

I got my new engine back from the rebuilder this week; 401, bored .040 over, rv cam. Is it worth the money to go with a high flow performance water pump? The price difference is about $60 and I have read that sometimes moving the coolant through the block too fast can hinder cooling. Also what radiator will work good? Stock one or one of those pricey BeCool units? Finally what thermostat too run?

Thanks
Max