You're holding it wrong...
1. Spec it out at Lenovo.com
2. Find it at a much better price online for any number of 'laptop outlet' type places
Did this 5 years ago with a Thinkpad W700. Prebuilt, rather than custom, so with me in a matter of days.
Wish I could replace it...8gb 17" 1920x1200 RAID 1, hardware colour calibrator that I've never needed but Hey!...and a Wacom Pad & Pen, active anti-shock HDDs, and a 170W PSU that weighs about a kilo.