Hi, I would like to offer you some advice but there's a few things I'd like to ask. What power supply and processor do you currently have? These are important in making a decision on what card to purchase.
http://www.newegg.com/Product/Product.aspx?Item=N82E168... try a card like this from AMD, AMD are in my opinion the best "value for money" cards. This is the 1gb verison but you can get a 2gb version of this card for around $150. The 7790 is a decent mid range card that will be able to play most of the current games at ok setttings.