How much is also an interesting question too, but for the sake of the general discussion, let us say as much as we are wiling and able to spend, since that will be so different from person to person. It is the principles that seem to pull against each other in my mind though, not the scale. Would I rather spend money with a higher risk of disappoint, or spend more money to reduce the risk of disappoint, and is it reasonable to expect more money to be effective in this regard? I admit the issue for me is more about tactics than cost, to a point.