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
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.