if u are in the quest for more power (ie fast), I'd recommend you save up for the TTE S/C kit and do everything all at once. Chips alone won't do much for the IS200.
Even if you do go ahead with the chip and then decide to go forced induction, you've spent unnecessary money on the chip when you could've used it to upgrade the S/C ie pulley or exhaust.
I've based this on past/current experience in modifiying my IS200.