I have been going on for about 2 years now without a "to go PC" and have always played on my desktop but since I will be travelling a lot from now, I'm thinking of getting Alienware 13 (2015) version.
My problem is, I can't really decide what to choose on some parts in customizing so I would like to ask help from the pro's 'round here
Here is my preferred build (and parts where I'm getting confused on) :
Soo... it's basically the Storage and Display that I'm getting confused about. Hope you guys can help me. Thank you very much
My problem is, I can't really decide what to choose on some parts in customizing so I would like to ask help from the pro's 'round here

Here is my preferred build (and parts where I'm getting confused on) :
Processor: Intel® Core™ i7-5500U
GPU: NVIDIA® GeForce® GTX 860M with 2GB GDDR5
Memory: 16GB Dual Channel DDR3L at 1600MHz (2x 8GB)
HDD :
256GB SSD @+120$ or
512GB SSD @+320$ or
512GB m2.80 NGFF TLC SSD + 128 m2.80 NGFF TLC SSD @+450$
Soo... it's basically the Storage and Display that I'm getting confused about. Hope you guys can help me. Thank you very much