the S14.5 with an SR20det will be a faster car overall. More HP, RWD, better balance, though it needs some suspension upgrades out of the box. At low HP levels, it'll be a more even matchup.
the blacktop will bolt right into a S14/s13, as will a redtop, and an RB25 with some light modification.
the lude is a handsome car, but i'd absolutely love an S14 with a JDM front end, or even an S15 front end conversion.