So you're at $1,219 +$100 for Windows 7 Home Premium 64-Bit OEM
$81 isn't a whole lot of room to get a good motherboard, you may have to cut some costs.
In general order I would go: case, hard drive, power supply.
Cases are personal preference and if you're sold on the NZXT Phantom then go for it.
However, there are a lot of cases for $100 or less that will work just as well:
are just a very few of the options available.
For the hard drive I guess you should ask yourself if you'll really need 1TB now or if you can wait and get a 2nd drive later.
$85 for a 500GB Barracuda
or $100 for a 750GB Hitachi
As for the power supply, you never want to get "cheap" with it but there are less expensive options that are still quality built and 750w.
are some motherboards I would suggest, depending on how much you can reduce your current total.
Please read through the thread thoroughly before responding.
Nobody wants to read a wall of text, formatting is your friend.
i5 3570k | 8GB G.Skill 1600MHz | R9 290 | SeaSonic 750X