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I think the choice is more between what sort of chip you want. A Dastek Unichip will set you back lots, but can be fine tuned to your cars other mods for good gains.
If you have no other mods, the best bet is a Group N ECU. This is the chip that RSport sell and Hillpower also sell this chip. It doesnt really give any more power, but improves the delivery of the torque and lets you keep near to peak power until 7800rpm.
from what i hear ABP f**ked up when they lowered adiclio16vs old 16v, didnt sort the brake bias valve out, resultin in the car lockin up when he had to brake and totallin the car, write off