I have a Geforce 8400 in my Compaq Presario SR5450F, but I'm a gamer of sorts and this video card doesn't work with a lot of the games I want to play. I was looking at the Geforce 9500, but it requires 350W and the power supply in my computer is only 250W. Is there any graphics card that will work in my computer for games such as The Sims 3 and Starcraft II? Could I get a new power supply that will support the Geforce 9500 AND fit in my computer? I was planning on getting the parts from Newegg.com if they'll even work. Thanks very much in advance for an input!