Hi @Savoir Laire
I dive out of Boynton Harbor Marina very frequently. I use 3 of the 4 operators leaving from there, Underwater Explorers, Loggerhead, and Starfish. All 3 of these operators are very good. None of them put a DM/guide in the water. Nearly all of the diving is drift diving on the reef. It would be appropriate for newer divers and a brand new diver. The max depth on the west facing inside reef is about 65 feet, most of the dive is shallower. Being new to the area and to drift diving, I would also recommend you dive with a guide, at least for the first 2 dives. Navigation of the reef is generally extremely easy and it is not terribly difficult to dive with the float and flag. You may have the confidence to dive by yourselves the second day.
Underwater Explorers takes only six divers, if you had a guide, there would only be a couple of other divers. Kevin Metz delivers very personal service. Loggerhead takes up to 20 divers, it is the biggest and most open of the 3 and does not feel terribly crowed most of the time. Starfish takes up to 12 or 13 divers, it sometimes seems very crowded due to the boat configuration. I recommend all three of these operators very highly, you can't go wrong.
+ another vote for all three. I've used these three ops as well. I can also recommend all three.