That graphics card is pretty WEAK. If you have $200 to spend on a motherboard, I suggest you spend like $120 on the motherboard and use the extra $80 to get a better graphics card:http://www.tomshardware.com/reviews/gaming-graphics-card-review,3107.html
What core i5 are you getting? is a unlocked? We need to know that before recommending any board.
Antec 850watt is overkill. If you aren't running more than 1 video card 650watt is more than enough (just use a brand name psu like Antec).
I am not sure about this but I rather using 2x4GB in dual channel mode than a single 8GB stick.