Shipping laptops with 6GB is nothing more than another ripoff from OEM's.
Look, I can buy one 2x2GB and one 2x4GB kit on newegg for a total cost of $20 + $35 = $55 and I can split them up to make 2 laptops = $27.50 per laptop. Or a 2x4GB kit for a total of $35 per laptop. It only costs the OEM $7.50 more to build an 8GB laptop, but on the other hand you can get a handfull of people that will spend an extra $80 to upgrade from 6GB - 8GB.
You're better off buying the 6GB model and paying $19
for a second 4GB module to swap out.
Main: i5-3570K, ASRock Z77 Pro4-M, Asus GTX660 TOP, 500GB Crucial BX100, 2 TB Samsung EcoGreen F4, 16GB 1600MHz G.Skill @1.25V, EVGA 550-G2, Silverstone PS07B
HTPC: A8-5600K, MSI FM2-A75IA-E53, 4TB Seagate SSHD, 8GB 1866MHz G.Skill, Crosley D-25 Case Mod