Also make sure your case has cooling-fans "of its own",
either built-in, in installed extra. The more the merrier.
DONT count the PSU-fan, its only 'good' for cooling itself...

You arent likely to find a case with a beefy enough PSU,
not at a sensible price anyway. So go for PSU-less cases,
end get a quality PSU separately.
(ThermalTake brand have always done excellent in my experience)

I have seen some cases with a built-in plastic air-flow "funnel",
sometimes with its own fan, to pull hot air away from the CPU.
Great idea, BUT make sure it lines up with your mobo's cpu position...

Power-rating of PSU? Big as you can get.
Power-rating minimum? Bit of a black art calculating that.
But some people here can, but its beyond my megre math skills...
Just be sure to leave plenty of leeway.

Best of luck...