help choosing a misc. equip. pump

[shifty51008]

looking for 1 pump that I can use to run 2 avast MR5 reactors (1for GFO, and one for carbon), 1 Avast MR10 18" (for bio pellets) and to feed my reefmania PS6 skimmer.

not sure if a mag 5 will be strong enough or maybe a mag 7? or what are you opinions.

Thanks