I've tried the one product line thing a few times with minimal results so now I rotate stuff from different lines.
The most success I had with a single product line was the Pantene Relaxed and Natural products though. They discontinued quite a few of the products so I couldn't keep it up.
If I picked one product line, maybe it would be Sebastian - simply because they have a moisture, level 1 protein and level 2 protein conditioners. Their ingred. list is pretty simple also.
Alright ya'll I think I can do it. Im going to stick with one product line for awhile. Im gonna stick with pantene. We will see what happens. The good thing is that Pantene is cheap and I can buy it anywhere. No more special trips to beauty supply stores!