Re: PC upgrade advice
Lucky for you, the Phenom 2 is still a decent CPU that you can get away with for a while. Should you upgrade it later? Yes, but for now there are more important things.
First and foremost, the GPU. Gaming is ALL GPU, well, 90% GPU. For $250 I would buy an eVGA GTX760. To give you perspective, it's even faster than a GTX580 comparing that to your 550ti.
After that, your case since you want a new case, and an SSD. If you actually use your PC for work, having an SSD can really increase productivity simply because it makes all general applications faster. Loading OS, loading software, loading your browser, you get the picture. I would get a 120GB Corsair Neutron GTX or a 128GB Samsung 840pro. Then use whatever HDD you have now as a data/storage drive for large games/Valve/Origin folder.
"Resolution is just a number." #Ubisoft Origin/Steam
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