also about case cooler in the back.. they always pull the air from the inside towards the outside correct?
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It depends on how they're installed...
They should be installed according to what case configuration you have. Common ATX, ATX micro arraingements similar to my Xclio A380 (in my specs) generally have intakes low on front and exhaust high in back. A side fan should be mounted low and set as intake. (or if mounted high = exhaust)
The idea is to draw cool / clean air from the front -(into the case low where the HD's are) and exhaust it high (because heat rises via thermal dynamic rules).
Basically, front + low = cool incoming / high or rear = exhaust.
Have fun!