There is only one ds3 made by gigabyte. Its a good motherboard too. That system looks pretty good too. If your on a budget, a cooler master centurion 5 is a pretty good case for the price (i don't own one but ive got a friend that i go to lan parties with and he owns 3
I didn't see a psu either. A froton 450w is a good budget psu or, if you want more power, i suggest the hiper 580w(i think im going to get one for a lan build later this yr but im not sure if i will have enough money for it but thats the psu i will go with if i do).
Also get a after market hsf for overclocking and some as5. I suggest the zalman 9500 or a scythe ninja with a good fan.