TRD 2-way. I preach it like .. a preacher, but for good reason because they can't be beaten. They're strong as hell, are silent when you want them to be, and lock perfectly everytime you want it tooh and i think it's cheaper than any other brand LSD too (kazz, tomei, etc)
Buy through jesse streeter or any of the other importers around (or sponsors on this site). Just FYI, they are only ~70,000Y on yahoo, so if anyone trying to sell you one says they're worth anymore, you're being taken for a ride.
For an F-series diff you have quite a few options for centres (as toyota had so many F-diff cars), but the easiest one to get from japan is one to suit an "SXE10" (RS200 altezza).
xo