Your gonna fail right off as the PSU requirement is MINIMUM 450W for that card http://www.geforce.com/hardware/desktop-gpus/geforce-gtx-660/specifications
The problem with trying to built a PC Gamer under $700US without a OS in hand is basically, the part for the level of performance isn't possible. Normally you need to stick to $700US or better. One option I often suggest is get a off the shelf box like a i5 from Walmart $349, which would include 8GB DDR3 (most games MINIMUM need 4GB so 6-8 is the norm for gamers PCs), 500+GB HDD, DVD, Keybaord, mouse, Windows, under warranty then upgrade the PSU to 600W ($99) then spend the rest on GPU ($149-499) gives you BF4 at High level, 1080p, 64Map performs around 50FPS or so. Basically that is the 'bar' most systems are measured at, better performance you need to spend more, less spent, less performance.