Thanks Dudley,

That gives me a starting point. I thought 4'was too short but that is not your experience.

Here's what I got:

Cortland Mini-Head Kit
Available in three different sink rates, each kit contains a 12 ft. length of sinking line and four braided loop connectors. These transform any fly line into a sink-tip line, and are a must-have item for traveling anglers. With this kit it is easy to build custom sink tips in different lengths and different sink rates. Loop connections make it a cinch to change tips and dial in that perfect drift, no matter what the conditions.

Sink Rates:
Speed 3: 3" inches/second
Speed 6: 6" inches/second
Speed 9: 9" inches/second

I got the 6"/sec. Now I am leaning toward making a 4' and an 8' to start. The 8' could become a 6'and a 2' if I buy more connectors. I would still like to hear more.