Cummins? No thank you. I think he has long term potential, but if we want our own version of Habana (in last weeks form), someone to abandon the wing in defense or rush up into no mans land, sure, he's the guy for the job.
McCabe may be a good pick, can't comment as I've only seen him play three or four times.
Turner may be getting a lot of attention for free, but I think a good defensive winger is a must. That said, Hynes is also a good defender and has worked on his kicking. Turner is probably the faster of the two, so I'd go with him.