Another reason to just build your own system. You don't have to worry about this. Speaking of the XPS Renegade system it seems they are all sold out; all 30 that were made are now gone
http://www.legitreviews.com/article/324/1/
Its all about how much are you willing to spend for better looking graphics. Spend $300 for max settings or $150 for for medium setting. $300 VGA card will also last longer than a $150; plus these days with SLi getting a $300 and then adding the another down the road is a good idea.
Coolermaster Real Power 550. One good thing about this is PSU is it is pretty much the SLi version as it has all the same specs as the Real Power 550 SLi version so that saves $.
You can compare them here if you wan to be sure.
Real Power 500...
No sense in leaving windows open when not in use; it just eats up resources. I know someone who does the same thing. It just slows a system down. Why would you want all your windows to open back up when you reboot? It just make boot up slower.