When I do my rear upgrade, I'll use the GT-R 4:11, the 6 bolt axles with MM billet 6 bolt companion flanges on the new stub axles I just bought. That is all I'll ever need for my use of the car, and I already have it all.
If I were looking to drag race it, I'd definitely be interested in a more bullet proof R230 set up, like the TechnoToyTuning kit.
Good luck though. You should be able to get others on board with you.