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#11
What power supply do you have? Going from the 9500 GT (which was almost as low as you could go when the Nvidia 9xxx series came out, only the 9400 GT was lower) to a GTX 480 (which was the top end when it came out), is also going to require a massive boost in PSU.
Video Card Comparison - GPUReview.com
50 W for the 9500 GT (card only) versus 250 W for the GTX 480. Something to consider before dropping money on the new card, as you may need to factor in a new power supply to run it.