Have you already ordered all of this stuff? If your budget is blown, chuck out the i7-3770K and go for the i5-3570K rather. That chops R1000 off your total and gives you enough money for a decent PSU. Trust me, if you want to skimp - by all means that's your prerogative - you will regret having to splash out extra further down the line. Its nonsensical in my opinion because a good PSU lasts you ages - with newer components sucking up less and less power, a 800W PSU for a high-end build could easily last more than three years. I'd much rather you go for the 800W I recommended than because then you don't have to change anything else when adding in another GPU.
As for the chassis, the Spacefraft is okay, I guess you could do worse. I'd recommend you look at these choices as well:
Antec One S3 @ R478
Antec One @ R518
Zalman Z9 @ R506
Personal favourite is the Antec One and all three have better build quality and features (USB 3.0 for the Antecs) as opposed to the Spacecraft.