I'm latching onto this thread as I have a question about these graphic cards and this laptop. I'm looking at getting the same laptop and I was wondering why you want to upgrade. I suspect that the K1000m is not powerful for your needs but was hoping you could share your experience about it.
Also, what applications are you running ? I'll be doing some CAD and FEA/CAE so I need a good graphics card. The usual recommendation is to go for the best possible (in this case the K3000m) but that only comes in the 17" laptop which is huge. As I need to take my laptop around me with a lot, I have a preference for the smaller 15.6", as long as the graphics card (K1000m or K2000m) is powerful enough.
Thanks for any insights or experience you can share