Ideally your intake should be located in the bottom of your cab. or as near the bottom as you can get it since the air near the floor is usually a few degrees to several degrees cooler.

Serious Seeds seem to get a good rep whenever I see them mentioned. I have not ran any of their stuff. But for what its worth, whenever I decide to run AK47, it'll prolly be their's unless my grow bud has some seeds at that time.