I would use the CI rear with the 1" axles. If you were to use the aluminum rear and replace the front housing, you'd have to mess with shimming the pinion gear anyway, so you might as well go to the CI rear and gain ~55 lbs. That's a free set of IH weights. I'm not convinced the 30mm axles are any stronger; the splined part is still 1" just like the older ones.
I reused my retaining ring as well. I think they were all still available when I did this, but the size I need was like $30 or something insane like that.
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