This questions already been asked on this site.. I'd refer to this post.. Some good information. http://www.tomsguide.com/answers/id-2479121/laptop-play-wow-300.html
If you are really that firm on a price... Reach out a little more and get this Laptop
If you want cheap.. Heres the cheapest you will be able to find thats "reasonably" what you want..
http://www.newegg.com/Product/Product.aspx?Item=N82E16823162032
What specifically are you having problems with in your home theatre?
You really didn't give me enough info to help you out.
Also this is in the wrong section.. Home Theatre would be a better place.