In Jupiter, I've had my best dives with Capt Sl8r and JDC. Sl8r is running Wednesday specials right now, rent a tank and get a 1 tank dive for free. I prefer the 2 tank trips, but you can't beat $20 for a ride on the boat and a full tank.
You'll want your Nitrox cert, else your bottom time will be 20-25 min. On Nitrox we get 45-50 min. I usually get a steel 100 and it works out just right.
Don't fret too much about the DM not being there, the drift currents and reef lines keep you on a predictable path. I've only had one dive where the DM was active in keeping track of the group and even then she wasn't trying to lead the group. I've surfaced at times to find multiple boats waiting next to my SMB to see if we were with them.
Depths, 60 - 90 ft. But 90's would be sitting on the bottom. I find myself in the 75-85 depth range most of the time.
Don't forget the shore dives at LBTS and BHB. I haven't been to LBTS yet, but I hear it's a decent shore dive. BHB I've been too countless times and is great for macro photography, checking out gear, and seeing smaller aquatic life. The cool thing is you never see the same stuff twice. Lots of small rays, plenty of fish, crabs, small eels, octopus, sea horses, nudis, etc. They also have free sponsored night dives a couple of times a week with Force E and Pura Vida.
---------- Post added February 9th, 2014 at 07:19 PM ----------
6) Before we bought tanks Eric had no trouble renting AL 100's, steels were a little harder to find.
Scuba Works in Jupiter has a lot of steel 100's. All the other ops seem to struggle with this. I think Abernathy gave me a LP95 and several others gave me AL100's. I think Sl8r is now renting steel 100's. Sl8r has his Wed special going on right now for a few months, rent a tank and dive for free. It sucks that it's only a 1 tank dive, but $20 is a great deal.