Easily, I can say that it's not worth getting the 580 or 590 right now. The 7970 is cheaper than a 590 by about $200 and performs pretty close in the benches shown here: http://www.tomshardware.com/reviews/radeon-hd-7970-benc...
In some cases the 7970 either beat the 590 or was close. Keep in mind the 590 is a dual pcb card.
There's a lot of bad reviews about OCZ SSD's so change that to other brands like Samsung 830 series 128 GB SATA III(6gb/s)
HAF 932 is great, a lot of air flow that is needed for a stable system specially when you overclock the CPU, a lot of space for future upgrades e.g GPU SLI or CrossfireX.
If you are looking to buy in the next two months I suggest you start looking a week or two before you plan on actually buying the stuff. Within this time period both new GPU and CPU will be coming out and performance for the same price could greatly improve.
In the meantime it doesn't hurt to learn all you can about what is out and maybe be able to add a bit to your budget too.