I'd buy 90 - 100cfm fans, simply because you can run them at 5v or 7v without a problem, while if you buy 69's (thats dirty) then it is much harder to 17v them.
I think the BI, BI2, BIX are all Copper inside, I'm not sure though. Someone out there will be able to shead some light on that.
I think the maze2 is about the best. The Spiral may be a bit better but you have to go onto a waiting list for it. The other option is a maze1c because it is much easier to mount.
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