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I'm a strong advocate of not taking another class until you've had adequate in-water time to become comfortable with the things you learned in the last one.
The way Bob phrased it, I completely agree. (He's one of the smart ones around here.) But, in general, that is not my attitude. Aren't opinions wonderful
I'm new to diving, but scuba isn't my first hobby. What has worked well for me is to take a lot of classes early on so that I don't learn bad habits. I find several of the best instructors around, and I sign up for classes from them, often the exact same class, and try to do everything exactly the way they teach it. When they teach something different I will ask "I've seen some people [whatever.] Why do you do it this way?" That way I'm learning the reasons behind the procedures and get a feel for their judgement and decision making. Once I'm out of the classes I can put together what I think will work for me.
My technique might not work as well with scuba because the quality of teaching is universally pretty low. I didn't feel like I learned much in my OW or either AOW classes. A lot of time when I ask "Why do you do it that way?" the answer is "It is easier to teach that way."
I found a good instructor and hired him for private lessons. I told him I wanted to learn buoyancy and trim and anything else he thought I should know. That was a fantastic experience, and cheap. After a few hours in the pool I was doing the basic skills midwater without moving more than ten inches or so. I even removed and donned my BCD midwater. That was a lot harder since all the weight was integrated. It certainly taught me the importance of splitting your weight between the BCD and your body. I am dramatically better because of the private lessons.
I would encourage you to seek out private instruction as well. The certifications don't really matter, it is the instruction. Find someone, or some people, to do a few half days with you going over the basics of buoyancy, trim, finning, etc. That way once you get out in the ocean you will be practicing good technique. I wouldn't be able to practice shooting a SMB and hovering at every safety stop if nobody had showed me how; I would still be holding onto the anchor line.
There are other threads on how to find a good instructor. But most people just want to certified and the market follows the demand. I doubt you will find many good shop classes. Check out your local schools. And GUE, of course. I'm looking forward to fundies. I'd be signed up for the next one in my area, but I'm going to be out of town :-(
Have fun.