Purchasing a w550s Touch full featured

[rfog]

Hello all!

I'm just searching for a mobile wks and I like the w550s Touch a lot, but I have some questions about it.

I'm getting it with 4G and 6 cell second battery plus 16GB RAM (one slot), but I have some doubts about HD.

My idea is to get the 512 SSD option, but it is expensive for a disk that will cost about half in Amazon.

Reading the Hardware Manual, I've seen it has a M.2 port to install a mATA disk. Then my idea is to purchase the bare disk version (called SSDISK 500 GB or so) and then purchase another non-Lenovo mATA disk and replace or install it in the M.2 port.

Then I will have 256GB SSD (M.2) and 500 GB and the possibility to replace the 500GB mechanical with another SSD unit.

However I'm not sure if that is possible or not or if it has any other problem.

I'm in love with the w550s Touch but unsure if that is possible or not.

Then I'm searching for your advice.

Thanks in advance and sorry for my poor English.