Eric is one of the trust worthy good guys, his chips are great. Price increased a year or so ago to $119.
I have done a few stock replacement chips, none required a change in fuel pressure regulator. The difference between the 5psi at idle is very minimal on a stock car. A modified car may require a adjustable or 237 regulator.
If you have no scan tool for data, I would buy a new chip made for your car. If you have a powerlogger or scanmaster then you should be able to verify if a used chip would work properly for your setup.