I would take:
3 X E8400
#1 Q832A550 1,7V 5,477GHz 5€ + Shipping
#2 Q036B810 1,7V 5,448GHz 5€ + Shipping
#3 Q018D016 1,725V 5,462GHz 5€ + Shipping
and 2 X E4500
#1 L748A153 465 FSB 5€ + Shipping
#3 L732B180 465 FSB 5€ + Shipping
Price per PN