You might want to consider the following:
Ocean Concepts - they have a number of dive operations on Oahu - I dove with them out of Ko Olina on the west shore (Mahi mine sweeper wreck). If you contact them they would be pretty up front about conditions.
Just as a follow-up to this thread, I arrived on Oahu a couple of days ago, and I decided not to bring any of my scuba gear or uw photography gear on this trip. However, once here, 5 other people attending the conference convinced me to go diving with them, so -- for the first time in many years -- I dove using ALL rental gear (from mask to fins!). We dove with Ocean Concepts just NW of Honolulu, and I have to say it was quite simply the best run land-based dive operation I've EVER seen -- and I've seen dozens!
Not only did they have the dive operation down to a science, with a preliminary briefing in the dive shop, complete with 42" plasma screen showing (by name!) our seating/tank assignments on the boat, and top-notch briefings on the boat itself, but the lunch/snack provided between dives was actually good (chips and hoagie sandwiches with plenty for extra helpings).
Most surprising and impressive was the rental gear. When making the reservation, they took our weight, height, and shoe size, and had already selected (and put on the boat) wetsuits for each of us (and ALL of them fit, even mine with my 13EEE feet!), and their BCDs and regs were top-of-the-line (Scubapro as I recall) models that I would be proud to own myself!
Most rental gear in my experience is hammered, cheap crap, so I was VERY impressed at the obvious extra expense they had gone to to provide high-quality gear! I'd have totally wasted my time if I'd brought any of my own dive gear!
Unlike most local day boat operations, they also had two huge rubber fresh water rinse tanks, one reserved for cameras, and the other for masks, etc. Although they didn't have a camera table, the excellent rinse tank was more than sufficient for a two-tank excursion (even if I'd had my full DSLR rig with me). They even had a fresh-water shower on deck so you could rinse off after dives, something rare on day boats (I only expect that on liveaboards). I kept looking for something they could have done better, and I simply could not find ANYTHING.
It was truly inspiring to see a dive operation this well thought out and executed, FAR above and beyond what most of us have come to expect (or even hope for) from local land-based dive shops. They clearly want more than just their customer's one-time tourist dollars; they want repeat business! If I lived (or spent much time) on Oahu, these would be the guys I'd dive with ALL the time!