Try an AlienWare computer, they go between $699 - $1000+
I would suggest this one if your looking for one around $600 -
http://www.dell.com/us/p/alienware-x51/pd.aspxAlienWare are great gaming computers, run great, ect.
Best thing to do when getting a new computer would be to buy all the parts and build one, So that way you can choose your processor and what not.
Good luck, Turmoil Cow