Oh, well....if you're looking for a substitute for the Diablo, the Head Speeds are your answer. Head copied the Prince head shape but gave it a 98 sq in head. Balance and feel are largely similar. Just a bit sluggish cuz it's a 98, but they've reduced the swing weight on recent renditions. (I'm comparing to the white Speed Pro. That's my reference.)
When their tennis really matters, Babolat Reps use a Wilson.