If you are going to spend that much, I would go with one of these:
I have purchased two of them, one for a Macbook Pro and the other for a new desktop PC. They are lightning fast in both machines, and MacSales.com customer service is some of the best I have ever dealt with. I would not hesitate to purchase from them again. These drives are also rated faster than the ones you linked, and at about the same price. My opinion is that the build quality and component quality is much better than the drives you linked also.
About the OS to install, I would definitely go with Windows 8. It is faster than Windows 7, and all the "under-the-hood" improvements are worth the learning curve. I am not a huge fan of the "Metro" interface, but I am playing with it here and there, and it isn't so bad once you get used to it. That being said, when I installed Windows 8 I immediately purchased Start8 for $5, and it immediately gave me back the interface I am used to working with. All said and done, Windows 8 is a definite improvement over Windows 7, as long as you get Start8 or one of the free alternatives (Start8 is far better than any of the free ones IMO), and it lets you "future-proof" yourself by being able to play with and get used to the "Metro" interface on your own free time.
I hope this info helps!