There I go speccing expensive products again
That silverstone 300w PSU would have been all right though I would have thought.
Anyway onto cases I have no experiance with the Asus cases but would urge you to look at
this one as well as it has 120mm fans rather than 80 and 92mm fans. None of the cases come with fans so you are going to have to buy some anyway, may as well get quiet 120mm rather than loud or low airflow 80/92mm. I realise that the CoolerMaster case is wider and taller (but less deep) if you have the space I would say go for it.
As for PSU you picked a good one
only consideration will be that the will be lots of cables floating around as its not modular, but nothing a few cable ties and a spare drive bay wont fix!