17 R2, installing new SSD

I have an Alienware 17 R2 laptop (warranty expired on September 30, 2016) which has Samsung SSD PM851 M2.2280 128GB.

Recently the laptop has slowed dramatically. Upon checking I found that the SSD has very limited space left, so felt a need to upgrade to a higher capacity SSD. 

There are three more NGFF (Next Generation Form Factor) slots available.

Please advise whether I can install the Samsung 860 EVO Basic Solid State Drive M.2 SATA III 1TB INTERNAL SSD & make it the primary boot drive?

Another option for SSD is Western Digital 1TB SSD M.2 2280 SATA III 6Gb/s Blue 3D NAND.

If any better SSD option is available, please advise. Please write if you need any more information.