It seems rather difficult to select complimentary parts to a Desktop. I am planning a new rig ... Processor: Intel Pentium D 820MoBo: Intel D945GPM or Asus P5LD2-VMMemory: 512 MB x 2, dual channel, DDR2 533, 240-pin DIMM. HDD: Barrcuda SATA 300, 160+ GB, internal. Would this be properly matched or can better selection be made?