I was having issues with my local lab (developing price and poor scanning was in the $7 a roll region), so I got the powered kit from B&H (C-41) and was amazed at how easy it was to develop my own film. My suggestion is try the power first, it's cheap to try and if it works for you....there you go, your in business. If it doesn't, time for the liquid kits.
Being stupid, I am considering the liquid kits despite overwhelming success with the powered kit. Why? Don't remember now. Only done C-41. And about ready to order my first E-6 because I want to impress my wife with medium format slides.
Bvy, thanks for your formula, I will try that on my next developing session.