I have 2 reasons I want the 83/74 wheel. 1: it'll allow me to swap between my 467, my 480, and this without having to pull the turbine housing, and 2: I don't currently have the fuelling or rpm range to really make use of an 87/81 wheel let alone a 96/88 (currently limited to around 3800rpm.
Plus down the road I can add a pair of gates, and an hx82, and have a decently quick spooling setup that doesn't choke on the small turbine side