so whats ur plan to buy now
and what r ur old system specs
Processor AMD Phenom II X3 720 BE
Video Radeon 4850 512MB
Motherboard Biostar TForce TA790GX A2+
Memory 4 gig of ozc gaming memory
Hard Drive 640 gb hard drive
Optical Drive any cheapie will work or you can get a blue ray.
Case Antec Three Hundred ATX Mid Tower
Power Supply BFG Tech LS Series LS-550 550W
you can upgrade/downgrade per your choice but overall it's a sweet machine.
my old machine was probably worse then yours.