And if you want to cheapen things up even more, you can get windows 8.1 Pro for only $23 from this website.
https://www.g2a.com/windows-8-professional-32-64-bit-cd-key-global.html
You purchase the key from them (and they verify it to be legal and working over a live chat with you), then just download windows 8.1 pro from the Microsoft website, burn it to either a CD or a flash drive, and follow the directions. I just did a fresh install on my SSD using this method, and everything is running perfect. Its a great deal!
Here's the link to the Microsoft website where you can download windows 8.1.
http://windows.microsoft.com/en-us/windows-8/upgrade-product-key-only