I would also look into getting a few YN-560 IIIs in the future instead of a 430 ex II. They're cheap, manual units only but trust me manual is the way to go. You can still use your 580 for your ETTL needs. The YN-560 III has a built in radio receiver too and they work as optical slaves too (something the 430s lack). Also the buttons are nice and big which makes changing the power or zoom head a breeze. The 430 requires some fiddling about with thumbnails.
but can you adjust them with the YN-622C over radio?
if not... they are not the best for wireless flash if you want to control you flash units from the camera.
for example you can´t control the YN-560-II from your camera menu with the YN-622C.
so you have to walk to the flash units every time you make an adjustment.
the YN 560-II has only on hot shoe pin so there is no path for that info.
i think to make the wireless adjustments work (via YN-622C), the flash has to support ETTL... even when you choose to use the flash in manual mode. or at least it has to have the hot shoe PINS used for ETTL.
so correct me if im wrong but the radio in the YN560-III only works with the RF-602 and RF-603 units.