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Go with the twin turbo kit. You'll have turbo lag with that setup however you can hit much much higher psi with turbos. A supercharger wont have any lag but wont top out like twin turbos will. the bigger question is if the is350 engine can handle high boost or not. SC's usually top out at 20 psi if its huge whereas a single 70mm turbo can hit 40psi...
I agree, we don't know how much boost the V6 will take, but EKanoo has built some very fast cars. How much power do they project from the kit you want? Remember in SA you always have a temperature problem, so big intercooler, etc.
They told me if I want it daily use it will be around +150WHP