If I were you I would go with the versitip-polyleader setups.  Most of the major manufacturers make them now.  I have some from Rio and airflow.  I want to say the ones I have are 10 footers and the have loops on the end to turn your floater into a sinker.  Just fished the McCloud a couple weeks ago and had no problems getting my sculpin on the bottom quick.  They come in all different sink rates from int. to ultra fast and you don't have to spend 70 bucks on a sinktip line that only has one sink rate and does one thing.  These only cost you 10-12 bucks and work great.