I don't like breath build at all, it may do brutal dmg if prolonged but feels ultra weak (almost like nothing happens). I wouldn't choose it even if they buff it a 100% dmg (and now is the best build supposedly). I really like frostscythe as ability and it really feels like a nice cleave spell.
Edit: also... all that "sindragosa" theme, ffs. I like frostwyrms and all that but I'm done with frost dks being crazy guys with swords depending on imaginary dragons that lend him abilities. I want what the lich king was. The lich king also commanded forstwyrms but he didn't need them to complement his frost abilities.