The contracts of Casspi, Anderson, and Butler shouldn't count against our cap space (if I am not mistaken). Casspi's deal is the room exception and Anderson's and Butler's deals are veteran minimums.
This means we have $4,619,956 in cap space with 2 roster spots open ($4,939,922 if we waive Stockton).
I'd waive Stockton, sign Andre Miller, sign Josh Smith, and either sign a perimeter defender, Evans/Acy, or another center for insurance with the 3 roster spots.