Please help me choose the appropriate jet pump.
I have one 3rd floor bathroom, two 2nd floor bathrooms and two 1st floor bathrooms. The kitchen and laundry are also located on the ground floor. Id like to have no less then 30psi available for the 3rd floor bathroom. My limited choices are a Goulds J7S, J10S or J15S. The only other pump brands commonly available here are: Eurostar and Speroni, hence my Goulds choice.
I will have a 300gal above ground storage tank feeding the pump and either a 44gal or 62gal pressure tank.

I've never installed something like this before so any other tips would be greatly appreciated.