People here can help you decide on components to take advantage of your budget, but when it comes to a case, it's pretty much buy what you want.
If you love a case, lets say the RV03 and it's a chassis you're willing to keep reusing, then do it up because not everyone likes some styling and you shouldn't worry about airflow since silverstone is freakin' epic with their functionality
Yeah that's true, it's a fight between the 600T and the RV03, although the RV03 looks just like the Alienware Aurora cases, which is pretty awesome. It's going to be one tough war.