Video Card

Hi GuysI know this topic gets dragged from piller to post but I need some advice. I'm looking at either Asus or Msi.Asus have the GTX 560 single fan at a bit above $300. The twin fan models of the 560 and 560ti range from between $350 to around $400 give or take.MSI follow suite along the same lines as well. However MSI have a 2Gig card for around the $400 mark making it sound like a no brainer but still like some feedback please. I only really play FSX but bearing in mind that MS Flight is coming out at some stage.Basicly is there much difference in the quality between these brands. Also can the single fan Asus GeForce ENGTX560 DC/2DI/1GD5 1GB be pushed like the twin fanned cards. Is it worth spending an extra $90 to $100 on a graphics card. Thanks very much for your feed back.Just a note: These are New Zealand $