First you have to decide what you need for diving before you purchase. With that being said, all you need is Mask, BCD, Regulator, Cylinder, Depth Gauge, Pressure Gauge, Underwater Timing Device, Fins, Weight (depends on the diver and exposure suit), exposure suit (location and depths being a variable), and of course the training (which you are getting). Other equipment (not including what standards may say for the training agency you are learning from--snorkel, etc.) is not a necessity. One thing that I tell all my open water students is, nothing replaces experience. That being said, computers are great, but the fundamentals behind what the computer does, is more important. As with most experience instructors would probably agree, when we got started we did not have a fancy computer or any other item that some say you must have. My suggestion would be to buy just the basics, go dive, go dive some more, go dive some more after that, and then start tailoring your equipment to the type of diver you want to become. I see students / customers all the time come in and buy all the gadgets (as a business owner I greatly appreciate the sales) and think that it is going to make them into a Super Diver, and then realize that some times those items do hinder them while underwater. Once you get comfortable underwater, always buy local for the practicality of gear repair and servicing, and if you live in an area where dive shops are like gas stations (one on every street), then pricing and competition should be in your favor. If diving in a club environment, then ask other divers what they suggest, keeping in mind they may be a different type diver than you. There is no magic setup that works for everybody. Most experience divers will probably tell you that they have went through several sets of gear through their diving adventures and the more they dove the easier it was to make a decision on what to buy. My rig that I primarily teach with would retail for $1500.00 US dollars, the rig I dive with in Public Safety Diving, Retails for over $5000.00 US dollars, and my fun rig that I throw on when I just want to get wet retails in the neighborhood of $500.00 US dollars. Out of all 3, my favorite is the one that allows me to go diving. Once again the experience is more important than the "Hey look what I just bought." Start out with the basics and work your way up. Now I know this probably did not answer your question on what gear to buy, as that decision is up to you. This was intended to get you to realize that there are a lot a types of gear that are great but not necessarily the most practical for the type of diving you will be doing. Hope this helps, and welcome to the life long addiction of Scuba Diving.