Gaming-wise, Black Pearl is miles ahead. Honestly, I wouldn't pay 1.5k for the Cyberpower PC Power Mega II if you are using it for gaming because the graphic card and sound system aren't that good . The Cyberpower PC Power Mega II operating system is Windows 7 PRO, you should be looking for OS HOME mainly because you're using it for gaming; and OS:Home is slightly cheaper as well.
@Rat, I will help you look one up after I get off work. But if you are looking to spend under 1k, try searching for the ASUS brand.