[Denman]

the continuos one is what we used last year (well, after the compo... weight limit etc)... You want to be careful. You want to make sure the wire is strong and preferably plastic or something. We used a metal wire thing and its really not nice at all. It curls back up and is really unpleasent to try and fix, even with gloves etc.
You dont need a yellow cable at all. the continous system will pull the top bit with the lifter to the top as it is. We used some extrusion (iirc thats what its called) with plastic runners, runs fine except the pullies are a bit cheap and nasty sometimes.