I will keep the case but I am warning you, this case is NOT good for a beginner and I generally do not recommend it to anyone as there are better options with less issues for less money. With the NZXT H440, you cannot get the performance you want at this price point. You will have to go to $700 OR switch the case.
For what you want, this is the realistic price point
http://pcpartpicker.com/p/sfyZWZ .I can bring the price down, but something has to suffer, the first thing that I would do if I had to skimp on something, is to get a 500GB HDD. After that, you go for a cheap case. Then whatever you choose after that will affect either your gaming performance.
You can add some green led lighting inside too.
I would go for this extra amount, as it will pay off. If you can't go above $650 as in it will take too long or whatever, let me know.
This is just one of those pricepoints that is on the border between ok and good in terms of performance and reliability.