Which computer system to choose?

which one would be a smarter choice a Xenon AMD Phenom II X4 840 3.20GHz Bundle - Quad Core , http://www.overclockers.co.uk/showproduct.php?prodid=BU-188-OK 156 pounds , and a 550W PSU for 20 pounds, my own case , cd-rom and a 160gb hard-drive (with which i'm completely fine with) OR a "Primo Drone" AMD Athlon II X2 Dual Core 250 3.00GHz DDR3 System - http://www.overclockers.co.uk/showproduct.php?prodid=FS-265-OK for 180 pounds?