Why do you want Windows 10 so badly
I really liked the blocky design of Win8 for tablets, like my Surface, but it's other features based around taking away user control (like automatically opening images in an incredibly useless image viewer) really put me off of it for computers.
When they announced Win10 would be free, and I saw the screenshots, I thought it looked great. I installed it on my laptop, and it works wonderfully. Best OS they've ever made. Also, a lot of programs will run better in a newer operating system like 8 or 10.
Also, in the process of upgrading these computer parts, I'm probably gonna double or triple my performance.
So, any software recommendations for the new PC?