first time piranha owner

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well i am a huge fan of the black rhom, but i also know they are the biggest of the piranhas and i know that rbp's are shoaling fish which are a little more AHHing. so im torn between these two, i guess the tie breaker would be price
 
ok for a shoal of RPB if i went with them, what would you say the max amount would be?
 
i would want them small and let them grow, i would probably setup the tank with live grass to give it a natural feeling, but again maybe 2" at least
 
how many do you think i could house in a 75 gallon?
 
i would get a whole buntch of reds because there cheap and throw like 15 to 20 in a 75 gallon.
 
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