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Use 25mm spacers for the rear and 15mm up front. You will have to roll the inner lip of the rear quarter panels though. At least I had to when I was on espelir/tokico combo. The front can remain stock but it still looked good. Keep in mind, I was running 245/40 in the rear instead of 255/40 like the stock IS size.
Modded Syspension (Supra Bilstein Shocks, KYB Rear Supra TT springs, front SC springs...) OEm IS250 rims with 235/40 18 front and 245/40 18 rear Conti 3.