Here is a vote for Mizani's Rhelaxer (sp?), mild strength. My sister, a cosmetologist for nearly 30 years, uses it on me.
Before I started using it, I used to have terrible issues with breakage and itchy scalp. The beauty school I went to used Revlon, perhaps that's what causes damage.
My sister did what was virtually my virgin head with Mizani, and the breakage has drastically stopped.
I also have my hair professionally colored with Redken Metro Color.
BTW, I don't do any relaxing at home. I get mine for the, err, "Family Discount."