OK, that means you now need another power supply if you want to upgrade the 8600. That 16a is lower than even my old crappy Thermaltake 430 unit that had 18a on the +12 rail.
You really are at your absolute limit with the existing 8600 card. No way that the GTX260 would even power up in your current rig. Trying to go budget for you, I'd recommend the Corsair 450VX for around $55 (give or take) from Buy.com.
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