Daystar will affect cv's the same as the franken lift. All of the current lib lifts affect cv angles even the POS 7" rock crawler.
They were correct that the Frnkenlift would void the suspension lift... oh wait that is because the only thing that will be left of the stock suspension will be the arms and ball joints (and they are crap bound to fail regardless)
I would go for the franken lift again. As for drivetrain stuff, My CV's are fine, and mine has been lifted and locked front and rear for 4 and a half years now. I replaced one CV shaft since dealer said that was bad, but after tearing it apart, looked fine to me...
Overall, I think you would be safe with the frankenlift, just don't let the BF wheel it if he has to brake something...
Just my 2 cents... ok maybe more!