Wow, those 2 fans have about 30 fins each! Would it be possible for you to pop the keyboard off again and get the model# for the fans? Not the model# for the heatsink but for the fan itself (i.e. Sunon/Forcecon/Delta).
I'm glad the Nvidia GPU is efficient at idle. Hopefully Optimus will support 3D before long.
I guess the benefits of getting a higher end CPU isn't that much because the temperatures will be higher and so it will probably turboboost less than the 4700hq.