5770 or 6770 doesn't matter as they are the same thing just rebranded.
Those temperature readings are wrong, I just wanted to make sure you knew that, there's no way you're near freezing.
As everyone has said, put the hdd on bottom. I'm not sure what else is in that big bundle of wires near the hdd in the pic but all wires should be tucked in the back. The rear fan wire should go across the top of the case, it'll meet up with the top fan wire. The cpu wire should be long enough to go across the top of the mobo and down the right side of it. Also might want to tie up the cpu fan wire or if you can, turn the fan clockwise so the wire wraps around it.
A side fan can sometimes make it hotter since it disrupts the airflow from front to rear, you'll have to test it, and also when you get a graphics card.