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The 600R is terrific for location shooting. If you're comfortable shooting with just one light, then it's an awesome, set of gear to have. Since you're shooting indoors most the time, the Acute pack would offer more flexibility, and you can always rent the 600R with a B head. In LA, the 600 pack rents for $35/day, and with the head it's about $50, so that's not too imposing for your occasional exterior shoots.
Also, if you buy Acute 2R, perhaps you can save up for an inexpensive portable lighting package from Calumet like the one below for $399. At 300 ws, it could suffice for the occasional outdoor shoot.