Guys, In addition of changing my i5 to an i7-2820QM, I was thinking perhaps of replacing my beast GTX460M. My question is what options do I have ? 570/485/580M or can I even go for the AMD mobile (6970/6990M)? Is it really worthy at the end (performance/price compared to my super 460M) ? I currently have a 150W power supply so I would need a bigger one obviously. The last thing in my mind is where could I find/buy this kind of GPUs ? I was looking on eBay but couldn't find any seller... Thanks for your help!