The folks over on the Nissan boards (mainly freshalloy) talked about an upcoming S16 replacement awhile back (I also posted on this a few months ago too). With the 350Z, and recent Maxima/Quest/Murano launches I don't think Nissan really has a priority for such a low volume car anytime soon. Although with the Silvia's cult-like status in Japan I don't doubt that we'll be seeing an S16 within 2 years. Prolly be close to what yianni said, about 25k tops with a turbo I-4, pretty much the same as the S15 I'd guess.