The best swap is no swap at all. The B18b/C1/C5 motors all have much more aftermarket support versus the H22, and they can make more than enough power to leave you sitting at the stoplight with the front wheels spinning.

The H22 will provide more power (especially torque) right off the bat, and it does have more potential, but I personally don't think it's worth swapping out a perfectly good B18b or B18C for it.

Now if you blew your stock motor and were looking for a replacement that would provide the most power period, the H22 is the way to go. There was an extended post not too long ago arguing which year H22 was the "best" for the Integra.

Shingo