For the theme of the Character, Personal Force Field would be best as I'm going for an ME style Sentinel, so armor and shields, layers of protection (maybe some psychic stuff). PFF is the best way I can think to have a shield.
I just popped in Champions for the first time in almost three years and I really love all the changes and new content. So I'm actually not sure, make the older costume pieces look as as the new is all I can come up with.