From what I hear, the IRS is pretty much a bolt in swap for the GT. The slickest setup I have seen is the Kenny Brown IRS - tubular crossmember and arms, revised geometry.
As far as those Tokicos, I believe the non-adjustables are the same as Illuminas set on 3, so as long as your springs are not too stiff they should work great. I have Bilsteins on one car and Tokico Illuminas on another and love them both.
I know what you mean about bad roads in CA. 350lb/in coilovers and Tokicos set to 5 makes me cringe over some of the damn potholes around here.
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