I've got the 510p (only 1 gpu), and its very nice powerwise for the price, especially if you don't mind dropping resolution. However, you should be aware that the keyboard keys are red on the side. It's unnoticeable most of the time but when you start the computer or wake it from sleep mode the keyboard glows red for a few seconds. You may find that objectionable if your going to use it for presentations, though there may be a way to shut it off. Also, if you "sleep" the laptop by folding down the screen, it can, at least on default settings, completely drain a full battery in a day or less. Both those quirks may be adjustable with windows or bios settings, though.
As the above poster stated, Nvidia's upcoming Maxwell gpus have great power savings. They may end up being beyond your budget for a while, though.
Edit: The above poster was you, TC. If you don't mind waiting for maxwell, you would probably be happy with the extra gaming prowess and power savings.
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