Asso tapered in 70lb mega stuff as is the bullet tapered,but like mentioned is expensive if your fishing the real ruff stuff.
The blue marlin is very very good,been using it for my rig bodies these last few weeks/mnths,knots incredibley well n is really supple,i know paul rants n raves about it,but it is true,proper gear,dosen't kink when u knot it n certainlly is strong stuff.
Reckon it would be good for your leader too,it's my number one rig body material now...