Well it clocks in at just over +12@18A so I would recommend 23A+ and that is good for at most 360w/30a
so it should last a good while. The modular connectors are not difficult to work with. That link also shows the cable connections in more detail, and you can d/l the product manual as well for more info.
For a decent case that looks good and won't kill your wallet check out the NZXT Apollo they have $20 MIR. Links to the silver
they are decent cases. Similar to the cooler master centurions.