Hi, I currently own a Dell Studio XPS 8100 with an Intel Core i7, 8GB RAM that has an MSI n8400gs-md1gd3h graphics card. It is not the stock card it came with, I had to have it replaced because the fan it the old one broke. I'm looking to invest in a new graphics card. My question is, is it better to get a higher end, more expensive one, or get another one that's not quite as high and run two cards? And if so, what is compatible with it? My current card is connected through PCI express, I have another free express slot and two PCI slots available