I recently bought a Manfrotto 488RC2 ballhead and a carbon fibre tripod.
Love the Quick Release. Bought a couple 200PL-14 plates for it.
I also use a monopod, a lot more often than the tripod, don't have a ballhead for it, and not sure I need something like that, other than to have the quick release capability. Is there something other than a ballhead (hopefully cheaper) I can add to the monopod to use those quick release plates? Or is a compatible ballhead my best way to go?

