Excellent. I am starting an Ironman character for my next one. I am thinking BH. I like the rules from Utherius and Billy Mays but with a few changes:
1. Aim is to reach level 50 AND complete Act 3
2. Adv Class and Companions permitted. I think these are basic and essential parts of the character and I just can't see ever completing the Act 3 final battle without a companion. (This may actually be harder since your companion might do something stupid that gets you killed.)
3. Companions must follow the same rules re: gear, etc. If a companion dies, you can never use that companion again.
4. White-quality medpacks and other consumables are ok.
For the challenge, we really need someone to blaze the trail, get to 50 (or as high as they can) and then declare what rules they used. The challenge will then be to beat that. IF I get past 20, I'll post my info and see if anyone can do better.