given that I don't care about looks i would probably go with the promax since it will probably work best. I did however use a slightly rusty 600 dual pivot for a while and it worked nicely. The single pivot campy would probably be my last choice.

Keep in mind that the brake pads will probably have more of an effect on stopping power. If you can fit nice new pads on the campy it will probably stop better then any of the others with cheapo pads. Of course if they all had nice new pads the promax would probably stop best so...