I'm with you here although I really don't think spending $100 is a bad idea. That's neither too high nor too low and I think it's a good for a total system budget of $1,200. On the other hand, I really don't like the Phantom 410 but case is subjective.
Looks pretty good. Personally, I would probably go for a 7870 since it seems like a stronger OCer in my experience, but that's not a big deal. I would also go for a cheaper mobo, something like the AsRock z77 Extreme 4.