Hey guys, so as the title suggests, I'm currently running two different NVIDIA GPUs (NVIDIA GeForce GTX 470 Galaxy, and NVIDIA GeForce 560ti). As of now I'm looking to sell those two off and put the money toward a single, more powerful GPU. I've seen prices of the 470 range from $30-$300 on Ebay so I'm not sure how much mine is currently worth, nor do I know how to gauge their value.The 470 is about 14 months old and the 560ti is about 6 months old. Is some sort of GPU Depreciation I should be aware of? My biggest question is: What should I be expecting to get from selling these two cards? Another questions is: Is there any real need to upgrade from this setup? Also, if anyone can suggest a newer/better card than what I've currently got within a $200-$300 budget, I'm open for suggestions. Thanks in advance!