MSI GT80 Specs question

***Sorry for not using the format as I have already chose to buy this model, just wanted to know what the differences in the GPU, CPU and HDD are.***

I have set my sights upon the MSI GT80 Titan. However, I don't know how to decide which specs I should go for..

Here are the differences in the options that I have..

GPU : SLI Dual GTX 970M VS SLI Dual GTX 980M

CPU : Sharkbay i7-4720HQ+HM87 VS Sharkbay i7-4980HQ+HM87

HDD : Super Raid-256GB SSD (M.2 SATA)+1TB (SATA) 7200rpm VS
1TB (SATA)...

MSI GT80 Specs question