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My next question would be - how easy are either of these gearboxes to get ratios for and maybe dog rings to replace the stock syncro's, I asume converted wants a close ratio set up for the new build, so that should determine which set up gets preference.

Re the sr20-de,
My info tells me 1998cc EFi DOHC 16 valve 4cyl.
Power: 119kW@6400rpm
Torque: 188Nm@4800rpm
Sourced from RWD 93-94 Silvia Q's.

It would be very interesting to find out if the later model sr20-de had more power or torque in stock form than the earlier types.

Looks like lots of homework for you converted - good luck mate.