You don't need a PCIII at this stage, an ECU bump is all you need, however, if you think you will be making more performance mods in the future...... get the PCIII.
Viewing the world on a slant.
"Don't tell me what a man says, don't tell me what a man knows, tell me where he has traveled" - Unknown
"The world is a book, those who do not travel read only one page" - Saint Augustine