I used to run one of those, not super loud, but not super quiet either. 3 of them is going to make quite a hum I think.
Maybe the icecap ones run quieter, does anyone know?
Good point on the fans.
I have no proof on this, but I like one pointing to the other end and having it sucked out because it just seems as though you are dealing with the heat more "directly". By passing onefan right over the bulbs and ballast the heat is getting "pushed" to the other end of the canopy where the other fan sucks it out. Like I said I don't know that this is more/less efficient.
In terms of safety I don't think it matters.
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