Normally not my favorite genre, but Todd Rundgren is a master. He did a power ballad intensive record in the '80's called "Nearly Human" that's loaded with great examples. Videos from the tour supporting that album are all over You Tube. Check out "Parallel Lines" and "Can't Stop Runnin" with Todd and Lyle Workman (now a big hollywood film score guy) on guitar. TR's never been afraid to have a monster second guitar in his band -currently Jesse Gress - and this is used to great effect on these power ballads. If you stretch the definition a bit, the bluesy "Unloved Children" from the same tour might be the best of these You Tube videos.
Marty
Marty