It is your money, however never trust a cheap power supply. It won't properly power your stuff. Honestly if you want to save on a case then look on Craigs list for a old server tower. But don't cheap out on the power supply. Spend the money and buy a good quality power supply.
There is no way that PSU will run even one Xeon let a lone two. Invest in a nice case and PSU, as MpG already stated if you get this case and PSU it will most likely end up frying the first batch of hardware. I would look at the Chenbro cases (Welcome to Chenbro) expensive but usually pretty damn huge.
oh definitly not using that psu for sure, but i only save like 5 bucks not getting it , so ill just get it anyway and use it for some other projects (i.e modify it to power a servo motor for my cnc mill)
If it's only the case you want, it's your call. But the case looks like a real loser too. The rear fan grill is brutally restrictive, it's only got mounting spots for 3 fans, and their positioning doesn't look particularly conducive to good case airflow. Depending on your plans, the case won't accept an E-ATX motherboard. You want a radiator in the front? The HDD cage is definitely going to interfere with any front radiator placement, and even if you move that, a triple rad is going to occupy ALL of the front slots.
I'd suggest diverting $50 more from your hardware budget. $100 may not get you a top-of-the-line case, but it'll give you some decent choices.
i7 2600K | ASUS Maximus IV GENE-Z | 580GTX | Corsair DDR3-2133