For storing media a green series is just fine.
If doing a clean install of windows I would get the SSD drive first, and then latter get a western digital green or blue of the biggest drive you can.
Clean install is the preferred method to avoid any possibility of a bad copy when cloning the drive
If you do want to clone your existing drive then you should buy a HDD now so that way you can move your media files off your current drive so that you can get it shrunk down to the size of the ssd you are going to buy.
As far as SSDs go: Samsung 850 is preferred, or go crucial for budget.
If it is cheaper then the crucial mx100, then that is exactly what it is - cheap. FYI if you see good reviews/benchmarks on Kingston v300 that is because...