This is the specs for Ideapad Z580: ($699)
Model Highlights
Part number: 215149U
Intel Core i7-3612QM Processor( 2.10GHz 6MB)
Genuine Windows 7 Home Premium 64
Intel Integrated HD Graphics 4000
8.0GB DDR3 1600 MHz
15.6" HD Glare with integrated camera 1366x768
Industry Standard Touchpad
500GB 7200 rpm
DVD Recordable (Dual Layer)
6 Cell Lithium-Ion
Intel Centrino Wireless-N 2200BGN
Bluetooth Version 4.0
One Year
Notebook
And Ideapad Y580 ($850)
Model Highlights
Part number: 209937U
3rd generation Intel Core i7-3610QM Processor( 2.30GHz 6MB)
Windows 7 Home Premium 64
NVIDIA GeForce GTX660M 2GB
8.0GB PC3-12800 DDR3 SDRAM 1600 MHz
15.6" HD Glare with integrated camera 1366x768
Industry Standard Multi-touch 2 button touchpad
500GB 7200 rpm
DVD Recordable (Dual Layer)
6 Cell Li-Polymer
Intel Centrino Wireless-N 2200BGN
Bluetooth
One year
Notebook
I've narrowed my choices down to these two.

They're on sale today, free shipping.. both $650 discount.
My budest is 700 dollars. so it's either stay in budget, or pay $150 more for 1000x more power.
