Well. . .Quite a long post indeed! Well i'll attempt to answer some of your concerns as will most others including the more experience cham owners on here, but first things first what type of lights are you using (ReptiSun,Exo-Terra, etc. . .), and you need to post some pics of your setup (chams...
If you can only get one right now i would go w/ Rep-Cal Ca w/out D3 Phosphorus free, then the Rep-Cal herptivite, and The Rep-Cal Ca w/D3 but thats just me. It also depends on what your feeders are being fed, but those three are the main ones i'd suggest