Get windows 8 and install classic shell to make it behave like windows 7. There are some advantages to windows 8, but the biggest is there is no "retail" edition of the software. With 7 OEM you have one license and it is locked to.the board. Change it and you need a new license. With 8 you can reuse it as much as you want as long as it's only on one machine at a time.
www.classicshell.net/