Wattabout the aftermarket manufacturers? Some sell them cheaper than the others and I'm wondering if price reflects build quality?
Not all the time. Pretty much of all the brands are good but XFX, EVGA are some brands with good customer base support. Price doesn't really reflect how good they are unless they have extra little stuff like a 448 core on the 560ti or a 2gb of Vram.
Also you could get an XFX 560 ti on sale and there price would be low. Another way to look at it is custmoer base. Some brand names are good but there customer support sucks. I hope this is a little help and good luck to you.