First of all, you have laptop memory. Secondly you have a high end INTEL mother board with a mid range AMD cpu and a low end Graphics card.
Look for these parts.
Budget Gaming ~600 (I'm going of AU prices)
CPU: Intel Core i3 2100
Mobo: Asrock H61M/U3S3 B3
RAM: Kingston 4GB (1x4GB) DDR3-1333
HDD: Western Digital Caviar Blue 1TB
GPU: 1GB AMD Radeon HD6850
Case&PSU: Thermaltake V4 Black Edition w/ 450W TT Litepower PSU
ODD: LiteOn DVD burner
Mid-range Gaming ~1000
CPU: Intel Core i5 2400
Mobo: ASRock Z68 Extreme4 B3
RAM: Kingston 4GB (2x2GB) DDR3-1333
HDD: Western Digital Caviar Blue 1TB
GPU: 2GB AMD Radeon HD6950
Case: Coolermaster HAF912 Advanced
PSU: Antec HCG-520
ODD: LiteOn DVD burner