the Millwakee is a good one, I use an Aquatek and I've had good luck with it for the last year and a half. A five pound cylinder will last me 6 month's or more. I have 2 and I just rotate them. Green Leaf Aquariums has some high end regulators if you want to go that route. I have found that a simple glass diffuser works fine for me, I also use a JBJ bubble counter. The Millwakee includes the JBJ but the Aquatek does not. Aquatek comes with a plastic one that I used for a while but I like the JBJ better. You will read a lot about needle valves and set pressure vs adj pressure but at the end of the day these are really not complicated at all and I very rarely have even touched mine other than to swap out the tank. There pretty much set it and forget it (once you have the bubble rate that you want). Hope that helps a little!! Keep us posted!