What I need to know do you wanna get any PCI component like Sound Card etc..
For now you have to change HDD to Seagate Barracuda or WD Caviar Black 32 or 64 cash and add SSD, if you did try SSD before you will never drop it like that
... 80GB at least for OS.
If you going for Crossfire in future you have to include that in your PSU going with OverClocking.
For OC CPU you need a good air cooler or water cooling like Corsair H80i.
Change WD Caviar Green 1 TB to WD Caviar Black 1 TB.
Add SSD 80GB or 120/128GB.
Add more Fans to give the parts some fresh air
in order to make it like this
Change PSU to 850W that include 4 Fans, Crosfire, OC 4600MHz/1.3V, 1x PCI-e x16, 5x USB Devices, Water-cooling, Electrolytic capacitor aging 20% and Blu Ray BD-RE/DVD/CD.