but there is the b20vtec which is the ultimate motor if you ask me. proves that DOHC VTEC is still better than iVTEC for raw power (2L vs 2L)...but this is gonna turn into a war now.
i have a video to back this up, although there is no direct comparison between iVTEC and DOHC VTEC, but the b20vtec takes down the s2000.

of course the b20vtec isnt a production car motor soooooo...flame away.

~kris