I agree with most of the replies on this post so far. Mixing and matching is great except for first and second stages (simply for servicing purposes.) Choosing the right reg is a very important decision to make seeing as it is what you breathe out of and I assume you like to breathe. The top two brands that seem to have the best reputation are Atomic and ScubaPro. Usually the decision on which one of these two depends on your LDC and which one they service. Where I live, its either one or the other. I have used both and am extremely happen with each. But the LDC I use only services Atomic, so thats what I went with. I believe the Atomic reg is a bit easier to service just because there is an extra piston in the ScubaPro that adds a little time and cost (but thats just what I hear, I dont do any servicing myself.) As far as BCs, its whatever feels comfortable to YOU and YOU only. What kind of diving will you be doing, have you used a backfloat before, have you tried a BP/W? In my opinion this is the second most important piece of gear to purchase. Zeagle has a great reputation, but there are lots of different brands that excel in this area. I personally use a Zeagle Escape. It is a little smaller and more streamline than the Ranger with works out will with being trim underwater and I travel easily with it as well. Unfortunately, they quit making this model. If I were to buy another BC, it would be a Hollis BP/W (that day will come, but probably not for another year.) I have been diving for only about a year and half and have learned not to just to buy a bunch of gear at once, but to be patient, try stuff out, and only buy the best you can afford when you are sure thats what you want. Don't skimp on what you buy, scuba diving is a stuff sport and you get what you pay for. Hope this helps and welcome to the dive community!!!!