Case will depend on what you would like to put in it.
If you give me a list of your kit, or what you would like I will give a few recommendations...
For cooling it will depend on weather you are thinking of overclocking, if your comfortable with using watercooling or if everything will be at stock?
If going for stock or mild overclocking Thermalrite heatsinks are among the best. Check out the XP-120 (very big) which takes 120mm fans. It doesnt fit all motherboards so check the Thermalright website first to make sure it will fit the one you plan on getting. The XP-90c is slightly smaller and takes 90mm fans but will fit on any motherboard. It also cools pretty much exactly the same as the xp-120.
I have two XP90cs on my daw...
They cool extremely well under load, never hitting over 40c (the alarm wont sound till 65c!!)
These with some Thermaltake 92mm silentcat fans give awesome cooling and near silent operation.
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