OK,
so the 560 ti would be that one:
http://www.asus.com/Graphics_Cards/ENGTX560_Ti_DC2DI1GD5/
It looks OK, but I wouldn't get any warranty with it.
For the 650ti I have a few options in my price range:
MSI N650Ti PE 1GD5/OC
http://www.msi.com/product/vga/N650Ti-PE-1GD5-OC.html
ASUS GeForce® GTX 650 Ti performance graphics
http://www.asus.com/Graphics_Cards/GTX650_TI1GD5/
ASUS GeForce® GTX 650 Ti DirectCU II dual-fan performance graphics
http://www.asus.com/Graphics_Cards/GTX650_TIDC2O1GD5/
The latest looks the greatest.
Also for those I would get warranty, which is good
I don't think that I would SLI in the near future, but one never knows. That's a pro for the 560ti again.
Also, does anyone know if the used 560ti is over priced or not?
Which to choose?