Imagination racing and asking questions is not a bad thing, seeking out advise from an experienced instructor will help make this whole experience a lot easier 
What tanks do you have or do you intend buying to double up? Depending on what size/type of tanks will dictate what kind of valves you have to buy and the isolation manifold between them. Also depending on the size/type is the band sizing which you would attach to your BP (or techie BC if that is your thing - but i think you were going DIR werent you = BP/W?). There are a few references to how to put together a set of doubles, some considerations on the board as well as at places like [www.diveriteexpress.com]Dive Rite Express[/url] and others. I used their recommendations to put my recently purchased Genesis HP120's together - seems well set now with a few dives on them
What you might need:
Valves that look like K valves, but have an open hole to the side (opposite handwheel) that you would attach a manifold to, a manifold. Unless you are doing independant, then try to get lefts and rights. If you want to dive dual orifice post valves (ie accept a manifold) as singles you need some plugs too, most new valves can be purchased with these plugs. Expect around $150-200 for a set of valves & manifold.
Bands - suitable for size of tanks, wider bands are preferable, but they need to be appropriate to the tanks. Expect around $100-150 for a pair of bands.
Second 1st stage for your other post, possibly a whole new reg set up to allow you one dedicated to doubles and one to singles. ($$$$)
Doubles wing - depending on tanks size you need a wing with a wider fabric area in the middle of the cell than a singles wing. Expect $250-350
Bolts, nuts and washers - plenty of. Pennies compared to the rest, just get SS Depending on the doubles you use and your exposure protection you may have to change you BP out to either SS or AL as well. Expect $60-130
For caving thing HID, a few back up lights, a primary, safety and maybe some back up spools as well. When/where are you thinking of moving to in Florida?
This is just something you have to research, unless you have the bits put together out in front of you and someone experienced explaining (suggested before you do it), its hard to get your mind around the first time without something tangible. Hope that helps
What tanks do you have or do you intend buying to double up? Depending on what size/type of tanks will dictate what kind of valves you have to buy and the isolation manifold between them. Also depending on the size/type is the band sizing which you would attach to your BP (or techie BC if that is your thing - but i think you were going DIR werent you = BP/W?). There are a few references to how to put together a set of doubles, some considerations on the board as well as at places like [www.diveriteexpress.com]Dive Rite Express[/url] and others. I used their recommendations to put my recently purchased Genesis HP120's together - seems well set now with a few dives on them
What you might need:
Valves that look like K valves, but have an open hole to the side (opposite handwheel) that you would attach a manifold to, a manifold. Unless you are doing independant, then try to get lefts and rights. If you want to dive dual orifice post valves (ie accept a manifold) as singles you need some plugs too, most new valves can be purchased with these plugs. Expect around $150-200 for a set of valves & manifold.
Bands - suitable for size of tanks, wider bands are preferable, but they need to be appropriate to the tanks. Expect around $100-150 for a pair of bands.
Second 1st stage for your other post, possibly a whole new reg set up to allow you one dedicated to doubles and one to singles. ($$$$)
Doubles wing - depending on tanks size you need a wing with a wider fabric area in the middle of the cell than a singles wing. Expect $250-350
Bolts, nuts and washers - plenty of. Pennies compared to the rest, just get SS
Depending on the doubles you use and your exposure protection you may have to change you BP out to either SS or AL as well. Expect $60-130For caving thing HID, a few back up lights, a primary, safety and maybe some back up spools as well. When/where are you thinking of moving to in Florida?
This is just something you have to research, unless you have the bits put together out in front of you and someone experienced explaining (suggested before you do it), its hard to get your mind around the first time without something tangible. Hope that helps
