If your considering an OW class, gratz and welcome to diving. Know this and read this thread carefully, until you have at least 20 dives you have no idea what you even need to learn in diving. You are a risk to yourself and everyone around you. You may have bouyancy control, you may know your gear, you may think you know what you need to be safe. YOU DONT and you wont after OW. Anybody who tells you otherwise is LYING to you. If you have the good fortune to be diving with somebody who has 50 or more dives I would say you are proably safe in the water. If your diving with your buddy who has the same number of dives as you, start praying.
Im sure there are many here that would disagree and point to my limited diving training as proof to just ignore me. I in turn would point you to my first thread post on this thread (aside from my hello) and then point you to my post
http://www.scubaboard.com/showthread.php?t=176093. You have poor training at best at OW you know nothing of underwater nav, deep diving, limited visibility diving (night diving). All of these items and probably more are essential to your training for you to dive safely. Keep that in mind before you and your buddy dive without an instructor or additional training.
If you need additional incentive to not just accept the quickest course that gets you your card. Picture this, you and your buddy have completed OW and you both have 4 ocean dives in monterey. You are now certified and safe. You and your buddy decide to celebrate and you take another dive you get out to about 50' depth. Your swimming aimlessly about and your visablility is getting progressively worse. In a period of less than 10 minutes you can no longer see your buddy and visibility is gone. Add additional problems your now lost you dont know up from down you have never been trained to deal with any of this. Welcome to red tide, no navigation training and no limited visibility training.
If you want to become a diver then plan on taking at least OW, AOW and a minimum of three specialty courses. Also plan on spending appx $250 dollars on basic gear that you must have for the course and an additional $1500+ to equip yourself with basic diving gear. My recommendation on specialty courses is deep diver, nav diver and night diver. Deep will increase your comfort at depth and allow you to dive to a depth of 130' with a more complete knowledge of the impact of diving at depth. Navigation will teach you how to move underwater, and protect you from becoming lost (you will probably still get lost, but it will offer you many ways to protect you from being lost). Night diving does much more than teach you to dive at night, it teaches you to dive in limited visibility and it increases your comfort level in no visibility situations where the danger to you the diver increases.
For your information, I have 24 dives and no instructor certifications. I most certainly have no idea what I am talking about. I have never taken any of the specialty courses I have mentioned. I have my AOW and 1 specialty (altitude).