ok, here is some pointers,
try not to pick a no name case, with no good reveiws, they tend to be made of really thin steel, and dont have good airflow.
PSU that come with some cases are sometimes really cheep and burn out in a month. but yet again just look for reveiws, and see what people say.
if you was a really matyre look i would say go for a lian li case, they are expensive, but they are of the best quality aluminum, and also are designed to have good airflow in mind. i dont think they come with
psu's so u would hve to buy one.
if you did get one with a window, then get a sleeved
psu, and a bunch of zip ties. i wont go into details of hiding you wires, because it is explained in depth in the fourms, just search for em.
i hope this helps,