I got certified in Ohio waters as well so I know what you are looking for. Just starting out, unless you are getting a dry suit right from the get go, depending on the year your dive season will last somewhere from approx. the middle of June to the beginning of October. Sp you are looking at water temps in the low to mid 60's. The warmest I ever saw it was 72 on the surface, and mid to low 60's depending on depth and quarry. So with temps being in the 60's cold water performance won't be as big of an issue. With that being said however, If you think there is a chance you might start doing some colder water diving (Nov-Dec and (Approx. Mar-early June) definitely look at a reg that is sealed for cold water. I agree with everyone else saying get your wet suit first, with the water temps what they are you want something that is going to fit you good right away. Computer wise, I have the Gekko which is the earlier version of the Zoop, I have never had any problems with it, it is a great computer and does everything I need it to. I am an SSI DiveCon so I do a fair amount of diving and it has never failed me on a dive. My battery is starting to run down, which is expected of any electronic device. I have had it for probably 5 or 6 years, but I can't remember when exactly I bought it now. Needless to say With over 100 dives on it, both air and nitrox, warm and cold water (40F-90F water temps) it has worked amazingly for me, although I will say mine takes a bit of time (Usually 1min or so max) to register temp at depth which is the only complaint I have about it. BC wise I have never dived an Aqualung BC other than in the pool trying it out, I don't have much input on it. I dive an OMS BC which I love, but started out on an Oceanic and haven't had any problems with any of the BCs I've ever dived with. Aqualung makes wonderful regs, one of my sister’s dives with a Sherwood reg, but other than that my whole family dives with AquaLung. My father and I have Apeks regs which I believe is owned by AquaLung, but I may be wrong on that so don't quote me on it. But with an AquaLung, or the Apeks like you can't go wrong, and it is usually somewhat easy to find a cold water rated AquaLung, especially in Ohio. Any questions just send me a PM. I hope this helps you out some.