Lenovo's quality has greatly improved the past couple years and are one of the more reliable brands to buy a notebook from. Consider getting this directly from Lenovo's website:
http://shop.lenovo.com/SEUILibrary/controller/e/web/LenovoPortal/en_US/catalog.workflow:item.detail?GroupID=457&Code=59371969&AID=10383968&PID=1225267&SID=XS75lK-dEeKeYhZ4I5Z1xwOeA1_ydXX3_0.M_0_0&CJURL=http%3A%2F%2Fshop.lenovo.com%2FSEUILibrary%2Fcontroller%2Fe%2Fweb%2FLenovoPortal%2Fen_US%2Fcatalog.workflow%3Aitem.detail%3FGroupID%3D457%26Code%3D59371969&PUBNAME=Slickdeals+LLC&NID=CJ
Use coupon code: SLICKDEALY500
Price should be $879. Not sure how long this will last, so consider it soon.
Cheaper faster RAM: http://www.ebuyer.com/274061-g-skill-8gb-ddr3-2133mhz-ripjawsx-memory-f3-17000cl11d-8gbxl
Not a big fan of Corsair CX line. They're not terrible, but just rather average being Corsair's lowest model series and it's OOS when I clicked on it. Consider this Antec HCG instead: http://www.ebuyer.com/245671-antec-520w-high-current-gamer-psu-0761345-06205-3
It's actually a rebranded Seasonic unit and it's plenty enough power if you decide for either of the video cards you mentioned.
Everything else looks fine unless you want to go with lower quality cheaper cases.
As mentioned in 2 posts above this one, consider getting this directly from Lenovo's website:
http://shop.lenovo.com/SEUILibrary/controller/e/web/LenovoPortal/en_US/catalog.workflow:item.detail?GroupID=457&Code=59371969&AID=10383968&PID=1225267&SID=XS75lK-dEeKeYhZ4I5Z1xwOeA1_ydXX3_0.M_0_0&CJURL=http%3A%2F%2Fshop.lenovo.com%2FSEUILibrary%2Fcontroller%2Fe%2Fweb%2FLenovoPortal%2Fen_US%2Fcatalog.workflow%3Aitem.detail%3FGroupID%3D457%26Code%3D59371969&PUBNAME=Slickdeals+LLC&NID=CJ
Use coupon code: SLICKDEALY500
Price should be $879. Not sure how long this will last, so consider it soon.