FSX is very CPU- dependent. Your graphics card is more than enough for FSX maxed, the problem is your processor. I wou;d suggest saving up a bit more and getting a new CPU, you won't see any gains by changing your GPU (in FSX, that is).
You won't get anything better than what you have for £70.
Can you overclock the CPU - the e4500 should overclock well - maybe get a new mobo with the £70
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