I am going to run speaker wire to the fireplace stage and outside the patio doors so I can play with the sound of the M60s.

I'll be picking up a PCi 20-39 (or perhaps +) in March.
One sub for now.
We drive to Florida for March break every year; I will have it shipped there to save on duty and taxes and bring it back across the border.

Would I be happy with two SVS PB10-ISDs located in the corners outside the patio doors?
Not as much of a conversation piece, but they would fit in the budget in the near term.