man utd fan gives louis van gaal transfer memo with six possible targets .
dutchman urged to sign gareth bale and paul pogba in summer spree .
southampton defender nathaniel clyne ` would cost £ 15 million '
mats hummels , jackson martinez and memphis depay also make the list .
total expenditure would hit £ 300m if all signings were pulled off .
read : manchester united must keep david de gea , insists phil neville .