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I thaught about the same as I'm getting a Nissan soon too. So I asked Heavy Throttle Performance for advice and that's what I got:
The S15 is the same engine as the S14 except for the turbo and the 6 speed tranny. The injectors are 480cc instead of the 370 in the S14. I think it would be easier to simply get the parts and upgrade the S14 engine.
Additions: 6 speed manual transmission. The 6 speed can be used on the S13 and S14 motors with no modification using the S15 driveshaft.
Well the injectors are available on aftermarket and if you want exactly an engine like that of the S15, you'd have to buy a S15 turbo (is available but rare).
For myself I'll go with the S14 engine and tune it up maybe an exact copy of the S15 or something similar.
Hope I could help you a bit.
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