The size of your display is a concern. Check the VGA Charts here at Tom's for great comparisons. I am running a 4850 on my current 19" LCD and have no problems whatsoever. At some point more expensive/powerful video cards only pay off at resolutions above 1600X1200.
If you dont mind a mail in rebate the HIS IceQ Turbo is the same price after rebate with a slight overclock and an awesome cooler. Even the free copy of Stalker Clear Sky is included. http://www.newegg.com/Product/Product.aspx?Item=N82E16814161244
Best of luck mate!