it's ok, I can't see how they can do it at that price. But if you trust the seller then it's good. The i5 is a better CPU whilst the GPU is weaker. http://www.anandtech.com/bench/product/1068?vs=1037
BUT the gpu is easiest to replace in the future. So I'd go i5 and 770. The PSU is very acceptable but could be better.