aliquidparadigm is right, if you want to be able to upgrade to multi-GFX cards in the future, you really should get a motherboard with multiple x16 slots. Mind you, it does come at a price.
Here are some:
MSI 890FX-GD70 with 4 full x16 slots
ASUS M4A89GTD Pro with 2 full x16 slots
Gigabyte GA-890FXA-UD5 with 2 full x16, one x8, one x4 slots
And that's just from the 3 biggest brands. But those are some of the most expandable AMD boards out there.
CPU: Intel Core i7-2630QM
RAM: 8 GB DDR3-1333
GPU: AMD Radeon HD 6770M/Intel HD 3000 Graphics (Switchable)
SSD: Intel 330 Maple Crest 120 GB SATA 3
HDD: 1 TB 5400 RPM Western Digital Scorpio Blue drive
Audio: HP Beats Audio (acceptable 4.1 on the laptop) and an Insignia 1000 watt 5.1 surround set
Display: 17" 1600 x 900 (laptop) and Samsung 24" 1920 x 1080 (external)
9 cell battery (7 hrs w/Intel graphics, up to 4 hrs w/6770M)