"I am shocked you are considering a Dell."
"Let me tell you about a friend of mine. I sold him my 8800GTS 640MB card and he went to put it in his machine. He needed more power though, Dell only include the bare minimum PSU with their systems, so we went out and got a PSU."
"I asked him if the tower was ATX standard and he said. 'YEP!' So I went and got him a nice 500W PSU from Cooler Master. But when he went to put the card in, it couldn't fit a 2slot cooler. When he tried to take off the big stupid plastic shunt for the hot air to be moved out the back of the case the plastic shell came off, but so did the CPU HS and the CPU as well since the CPU was actually glued or welded or SOMETHING to the HS!! He bent the pins. So now he is dropping a few hundred just to build a new rig."