HAF 912 is not a good case, at all.
Antec 300 illusion is far superior, but my sugggestion is this lian li because its on an insane sale right now:http://www.newegg.com/Product/Product.aspx?Item=N82E16811112337
It is 64 bucks with promo code, leaving you with 56 bucks for a power supply, which i suggest this one:http://www.newegg.com/Product/Product.aspx?Item=N82E16817371016
46 bucks after promo code. This PSU has ample power for any single GPU on the market. Another large plus is that it is modular, meaning you can only use the cables you need, and not have a ton of wires you need to bury in your case. It usually sells for 64.99.