As far as who is on the roster, Singler, Huestis, and Roberson can all play SF. Assuming Russ doesn't get traded, how do we fill out the roster?
Who's available in Free Agency:
Lance Stephenson
Dorell Wright
Harrison Barnes (please don't suggest Harrison Barnes)
Mo Harkless
Lance Thomas
Alonzo Gee
Damjan Rudez
Jordan Hamilton
Quincy Acy
Metta World Peace
Allen Crabbe
Tayshaun Prince
Damien Inglis
Cleanthony Early
James McAdoo
Chase Budinger

My suggestion: sign Crabbe to a big offer sheet and pray Olshey doesn't match. He will, though.
Or go for Harkless.
Thomas could be useful as a 3/4 tweener, too.