I like the effect that biots give a fly's abdomen. I love fishing the Pheasant Tail Nymph too. Here is a nymph that I started tying regularly for the end of least season that combines the two:
Hook: B175 #14
Thread: 14/0 Sheer, olive
Ballast: Flat lead (optional)
Tail: Pheasant tail fibres
Abdomen: Turkey biot, olive
Thorax & wing bud: Pheasant tail
The biot is tied over a thin layer of cement for better durability.