Alienware 15r2: Plextor M8pe SSD

Greetings,

        I am planning to buy the Alienware 15 r2 and in my current spec I have 1TB 7200rpm SATA 6gb/s. I am planning to buy and load a pcie SSD, so this is my choice Plextor 256GB M8PE(G) M.2 2280 NVME Solid State Drive

My questions are,

a) Is the above a PCIe SSD?

b) If the answer is yes to the above question then, have I chosen the right kind of pcie ssd compatible for my AW 15r2? 

c) If there are other brand pcie ssds please give me your inputs(less expensive ones)

FYI I am currently located in Thailand.

Peace!