the 760 is $250 and the 770 is $330 in America. The difference in performance is not worth the price. It would have to be a lot more performance for the 770 to actually be worth buying it over the 760
You should look at the R9 280x, it beats the 760 and definitely puts up a fight against the 770 It is $309 but definitely worth the money
Given your current pricing i would favor the 770, but it is up to you. As stated by coline an 80 dollar difference makes it not work it, but a 20 is probably worth it.
http://pcpartpicker.com/part/xfx-power-supply-p1550sxxb9
is better and cheaper power supply
Also I would buy the i5-4570 or i5-4440 or the i5-4670k.
Pair that with a cheap z87 or z97 motherboard.
Also are you sure you can;t get windows 7 for a lower educational discount or something like that.
Video Card:MSI GeForce GTX 760 2GB TWIN FROZR Video Card ($229.99 @ Newegg) Total: $229.99 (Prices include shipping, taxes, and discounts when available.) (Generated by PCPartPicker 2014-06-08 22:07 EDT-0400)
Video Card:EVGA GeForce GTX 770 2GB Superclocked ACX Video Card ($309.99 @ Newegg) Total: $309.99 (Prices include shipping, taxes, and discounts when available.) (Generated by PCPartPicker 2014-06-08 22:08 EDT-0400)