id go with the LS. It has good torque for a 1.8 (127 ft/lbs), and all the turbofanatics love em. I mean dont get me wrong the b20 is also a good motor to turbo but the cylinder walls are very thin. Also another disadvantage is that it wont pass BAR since its a light truck motor going into a car. Get an LS, build it up and slap on a turbo and ur all set.