Thanks for the responses. Most of you recommended 780 or 290 so would either of these cards be good or should I find a different one?
http://www.ncixus.com/products/?sku=93753&vpn=R9-290X-EDFD&manufacture=XFX&promoid=1264
http://www.newegg.com/Product/Product.aspx?Item=N82E16814130918
Also for anyone who said crossfire I would need to buy a new motherboard and case because I currently have a mini-ITX build.