The i5 3570K better priced chip. It 170 at micro center with a 40 dollar combo deal with mb. Cosair n200 and n300 not bad case for the money.
Bitfenex and cougar also on new egg have nice mid tower cases.
On the case look for ones with cable managemt and can take gpu cards up to 12 inches long.
If you can wait 30 days. The new intel haswell and the newer nvidia 700 cards are dropping. Some of the higher end 700 cards are showing up on new egg. Next week intel haswell CPU. When they drop look to see if the ib CPU changes in price and see if spending a little more on the CPU for some extra speed.