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My vote goes to a proper Z6 swap, which includes the OBDI conversion.
I happen to have the converted engine harness for a Z6 into a '91 Si hatch, distributor conversion harness, and the OBDI conversion harness. From RyWire.com you'd pay $319 plus shipping. How does $280 plus shipping sound? I also have the VTEC/O2 subharness you'll need for another $40...it's $55 at RyWire.com. Then, provided your Z6 comes with the distributor and O2 sensor, all you have to do is hook everything up and it'll fire right up. I'm willing to sell for two reasons, 1) my Si is wrecked and I'm getting an EG hatch to put the Z6 into and 2) I could use the money for some drum gear.