I was looking at a 96 S2 R33 with FMIC, Apexi AVC-R, ~ 140'000ks, 17" rims, suspesion, body kit, exhaust Turbo Timer and BOV.
Was an Auto and the owner was selling it for $14'500
So your one beeing a 5 speed and 97 model should go for around $16500
At the end of the day its worth what ever somebody is willing to pay you for it.
Start high that way you can drop the price if it doesnt sell, just keep in mind that these cars have dropped a heap.
You can import an R34 for alot less than you think these days!
Good luck with the sale mate!