the reason lsvtecs and crvtecs are popular is because of the long stroke of the CRV/LS motor. This translates to more torque output... Coupled with a higher-flowing VTEC head, upgraded internals to withstand higher revs, lsvtecs and crvtecs are real powerhouses.
The B18C5 can be turboed successfully, but only with very good tuning. With a high compression engine, theres less room for error before you start to cause serious engine damage, so the tuning has to be spot-on. If tuned well, the c5 will make tons of power... more than a comparably boosted c1 or B, but its harder to get there.
Sensei, got any links to your car/dyno plots/etc?