yeah, i say about the slippers out of personal experience - i have a lot of mates on the south coast with s14s and s15s, and I was well impressed with the way they worked compared to the usual 'spin one wheel up' standard cossie unit. i know of two drifting s14s that use standard diffs and they drift lovely - unless I was doing some mega international competition i'd be happy using the standard diff in a 200... just my opinion after having driven a few. (and having driven a few cossies to compare!).
with a tiny bit of work, a cossie could be on par or better than a 200 any day. The winner of the gatebil drifting series in Norway last year was a beaten up old Mk1 Capri with a 300bhp Cossie and an Atlas with a ZF modified on the plates. It HAAANNNNGGGSSSS! Beat 900bhp Supras, 200sx's, Corrollas, M Coupes the lot! SO if that can do it, a Cossie can!
Ben