Hi,
First, what is your budget? Also, what is the wattage on that Silverstone?
If it is good like 550+w, then I would look at something like this:
http://www.newegg.com/Product/Produc...82E16814102093
Another good choice if you have the budget:
http://www.newegg.com/Product/Produc...82E16814102071
Keep in mind an X1950GT is just an underclocked X1950 Pro, so if you get the GT, you will likely be able to overclock it to near Pro speeds.