is the Halcyon you already have a doubles wing I assume? Being that you mention you want to set up a recreational kit also, if you are looking for a nice singles wing (there is no such thing as a good 'one wing does both') take a look at the Halcyon eclipse 40..
the thing is, with a bungie wing (and this is speaking as someone who OWNED an 80lb bungie wing) you get the bulk of a larger wing, but you can never really get the 'full' lift out of it because of the bungies. they will always trigger the overpressure before full inflation unless you have them very loose, and then you have a very bulky wing.
the thing with using a 'big' (read: doubles) wing with single tank is that it doesn't matter if the lift is 'small' enough, its the width of the area inside the wing is too big and will wrap up the side of the tank and cause 'taco-wing'. i have yet to see a doubles wing that actually works (with advertised lift capacity) back and forth between single and double tank.
cheers,
Laura