NP, Yeah, ~5'C cooler sounds cool, for now
The MB is very important component and I believe it will never be overkill. It is a good idea to invest on a good one, specially for you, it costs almost nothing compared to those "cheap" 975 you got.
Why didn't you get i7 920? or even better, wait for upcoming i7 930 which is right around the corner and 4 of them would cost almost as much as one 975, and would OC as good (for 24/7 use on air).
Those "cheap" 975 shows their strength on subzero cooling, but they OC almost the same as i7 920 for 24/7 use on air. The OC headroom of i7 depends on batch#, not the the model#.
Probably you can get a better 24/7 OC on air with a good batch# of i7 930 (you have a better chance to get a good batch# at the first days of release). I don't remember the exact resale date for 930, but should be here soon.
4 systems exactly the same OC? What are you up to, and what are you going to use them for?.
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