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For proper flow, which is what is important, you need to have two openings... one in and one out, otherwise the air has to go in and out of the same opening. It's like having a window open on a windy day... close your door and generally you're fine, but if someone opens the door it blows a gale in the room and paper goes flying.
And if you're not overclocking, I wouldn't overly concern yourself with what temperature it is all at... so long as it is stable. As you've stated, it isn't when the door is closed, so don't close the cabinet door when it's in use.
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