from the two RC games as i see it, either cooper or foley to start ( i prefer QC (Quade Cooper)), To'omua at 12, TK at 13.
on the bench you can't have both cooper and beale, nor can you have giteau and cooper, i think QC (Quade Cooper) starts or isn't in the 23, similarly with foley, 10 or out.
the bench options i think are giteau or leliafano (inside backs) and one of horne, beale, mitchell, AAC (Adam Ashley-Cooper), tomane assuming that speight is one wing, and one of those is the other. personally i would go with speight and horne starting and AAC (Adam Ashley-Cooper) as the reserve. beale is a match winner but also a possible match loser, i don't think he should start but is a great option off the bench in the last 10 -15.