You should check if your CPU can be overclocked (EXPERIENCED PEOPLE ONLY!!!!! ask a friend that has some knowledge in CPU if your are not good with these things)
Because your Video card is good for an other 6 months
Rams last nearly foreever lol
Your Motherboard is good ( unless you want crossfire or SLI )
If you want to change your CPU you must stay with AMD or you'll need to change to motherboard too and that mean money money money.
and Your CPU is good enough for an other 3-6 months even if you can't upgrade it
If I was you I should wait a bit before changing your computer or any parts in it
(When you're reading specs req on game box, they are most of the time saying Athlon 64 or Pentium 4, You'll notice that your CPU is 1,5 to 2,0 times much stronger than those listed on boxes because of the technology and the performance that are better nowadays)