How important is it for me to have a dedicated "water ski" rope? I'm basically a beginner on the slalom.

This is the rope I've been using. it's my "spare" cheap-o rope.
http://www.walmart.com/ip/20961573?w...896632&veh=sem




Obviously, I know that true comp skiers use a stretchy rope that will allow them to get that last couple inches to the bouy. But that's not me...

So how important is the rope in the equation?