I wasn't so concerned with the size of the brakes as the size of the bolt pattern for new wheels.
Though it would be sooo tempting to get cool new wheels, it would be more important to have a more common wheel size before that I think.
It would end up costing less because of the uncommon 4.0 bolt pattern and would open up a world of wheels for it.
Also one spare would be good for the whole car instead of needing two.
There are people on here selling A arms, hubs, and such.
I would talk to Tony (whitepunkonnitro) on here and see about a big bolt pattern change, as I'd bet he has it right now.
4.5 patterns came on a bunch of different makes and are real common.