This isn't the nicest-looking laptop (and no backlit keyboard, it seems), but it's only $1400 for this Sager NP9170 with an Nvidia 670M (570M rebrand with 5% OC). http://www.reflexnotebook.ca/index.php/sager-np9170.html
There's also this MSi GT780DX with an i7 and 570M for $1470 - I'd personally go with this one unless you want an upgraded CPU. http://www.amazon.ca/MSI-GT780DX-277US-17-3-Inch-I7-2670QM-SuperMulti/dp/B0062JM6EQ/ref=sr_1_2?s=electronics&ie=UTF8&qid=1334344817&sr=1-2
And then there's something like this Toshiba Qosmio X775 for $1800, same CPU/graphics as the Asus, but it also has Nvidia Optimus, so it'll get probably ~4-5 hours battery for basic usage. It's biggest downside is the 1600x900 screen instead of 1080p. http://www.amazon.ca/Qosmio-X770-02p-Intel-I7-2670qm-878gb/dp/B006A93HOQ/ref=sr_1_cc_2?s=aps&ie=UTF8&qid=1334346167&sr=1-2-catcorr
Lastly, there's an Nvidia 660M Kepler card coming out probably in the next month; it won't be much faster than the 560M (maybe 10%) but it'll use less power. And of course, Ivy Bridge mobile quads are releasing in the next 2-3 weeks. I would wait until early/Mid May to see what all is released by then. And one more question, do you just want something powerful, or do you want a 17" specifically? There's really not much performance difference between 15" and 17" for laptops with a single graphics card.