The link shows that he got this : Video Card: NVIDIA GeForce GT 520 1GB 16X PCIe Video Card (Major Brand Powered by NVIDIA) and that upgrading to what you said would have been another 156 dollars.
So I don't know which is right. The link and the specs he copy pasted are different. I was going off of the link because the formatting of the copy paste was rough on the eyes. If he actually did get a 560ti then yes you are correct. Still sad to see that if he did that he would have spent over 1100 USD. Making a similar system costs around 800 dollars right now and that would be with an upgraded motherboard and CPU to a 2500k :/
You are probably right, Im not terribly knowledgable on creating PCs, and Im sure I overpayed.
I am getting a nice monitor/speakers/mouse/keyboard though, as well as a custom tower.
Worth the upcharge? Probably not. At least I know it'll be created right though.