I've been doing the 85-89 bracket as a twinked lvl 85 Death Knight. Got a 100k Obliterate with PoF, pot and berserker. It's funny how the scaling works, it doesn't scale every gear piece to the same ilevel. My 450s for example don't scale down much at all.
I heal in 90 PvP as MW so unfortunately haven't done much outside of that.