What's wrong with sharing a build? Knowledge is power, knowledge shared is power multiplied.
I see it that way. If you really enjoy the Lvl 1-50 part of the game, both Ill/Rad and Ill/Dark (well, pretty much anything Ill/*) will feel more fun, useful and self-sufficient even without perma PA compared to Ill/Cold. Ill/Cold is a build that only really starts to shine at the late stages of the game and will feel pretty meh with basic IO slotting on your way to 50(+) content.