Don't get hung up on buying a reg you can grow with, it just not worth worrying about at this stage of your diving. Tech diving reguires a lot more gear and you will be buying several more regs if you do go tech, no way around that and odds are you will want 2 identical regs when you go tech so unless you buy 2 now, you will likely have to buy 2 more later anyway. That nice simple mid range reg you buy now can become your stage bottle reg later on and if you don't go tech, you still have a good reg to dive with. Pretty much any of the brands you named as well as HOG and Edge will fit the bill for now. The one thing to consider as much as brand is the location and quality of the service shops in your area. You will want a reg that can be serviced locally by a good tech unless you don't mind shipping it off for service and all the hassel that goes along with that.