What are my best options...?

I have a '96 GSR with bolt ons, im looking to boost in a few months. Run crome...
I'm looking to convert to OBDI from my OBDIIA, no big deal the harness is easy enough to order. Finding a p72 that's OBDI is really hard to find! It still need an ecu to control the IM butterflies...so i can't run a p28 or p06 unless its modified = more problems...

I want to convert to OBDI now, and run a chipped gsr base map...but on what ecu? A OBDI p72 that are hard to find? Because the ecu is chipped I can just go to a tuner and get it tuned with crome with I boost in a few months?