Nice build. My thoughts (since u asked)
1. Microcenter has great sales on 3570k & MOBO for just under $300 with tax
2. May want to consider ASRock Z77 Extreme 4
3. I would not go below 120 GB SSD ( I love my intel 180 GB !!)
4. 3570k for over clocking, but not CPU cooler. If not overclock i would not get a 'k'
5. I would go for the HD 7850 (x2 if you got the cash). If you don't have the cash, I'd buy one and wait for the other - there's always Christmas
Good Luck !