The nice thing about a chipped LPT vs. a stock HPT is that the torque and HP are available at a much more usable (lower) RPM range. If you had a HPT with manual trans, you might barely outrun a chipped LPT, but if the car is an automatic, I bet the chipped LPT will outrun the HPT every time.
I have put over 80k miles on my car since I put in the Wetterauer chip (230 HP, 254 ft-lbs) and have been thrilled with the upgrade. From what I understand, the ipd ECU has comparable power, and no need to have any soldering done on your ECU. If I were to do it again, I'd go for the ipd ECU since I never swap back in the stock chip, which is the one advantage of the Wetterauer. At the time, my car was still under warranty, which is why I went the Wetterauer route.

Gordon
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86 240 DL 120K; 98 V70 XC 125K(Bilsteins, ipd strut tower brace & sway bars, Wetterauer chip)