Hello AVirusC,
I was recently shopping for a laptop as well and the a8 ACER suggested above is the absolute best gaming laptop you will find for under $750. It is the one I decided I would buy. I am waiting till January now, but that is still an excellent system.
Here are the good specs that it has:
Quad-Core mobile processor - Compared to the Lenovo the performance is not a lot worse, only a little
Graphics Card - The AMD 8750M is quite powerful for a mobile graphics chip. It is plenty capable of playing all of those games. See here for the FPS that others were able to obtain using this card.
http/www.notebookcheck.net/AMD-Radeon-HD-8750M.87147.0.html
Crossfire: This system actually has two graphics cards built in. The 8750M is the dedicated card and should be used for all intense gaming. The APU also has a dedicated graphics processor which can be used instead to conserve battery life. These two graphics processors have the ability to work together to potentially boost performance in games. While using both cards will increase power usage, it is not certain to increase performance in games. It may in some cases give a significant boost in game play, and in others it may give slightly worse performance. You will need to experiment with this to see which way to use it for different games but it is still possible.
Four built in speakers which should give excellent audio for a mobile system:
http/us.acer.com/ac/en/US/content/model-datasheet/NX.MCUAA.002
The last feature is the ease with which you can switch parts. You are able to remove the back case and have complete access to several parts inside of the system. For the price of $530 you can have the laptop, but its simple and in your price range to improve it. One of the most held back aspects of the system is only have 4GB of RAM. For $60 you can buy an 8GB stick of RAM and simply add it to the system. This will max the system out and insure that you never have a bottleneck from the RAM.
Based of prices and performance, this laptop is probably going to remain the best laptop for gaming that you can buy under $750 this year, and even at $750 the upgrade is negligible. I honestly believe it is the best system available. The only reason I am not personally buying it is because I am waiting for the next generation of AMD processors to come out in January, because I will use the laptop I purchase for at least 5 years and I want to get the most performance within my price range as possible. Even considering this, I am still extremely tempted to purchase this laptop, and it is only through great difficulty I am avoiding the temptation of buying it.