If you want to stay NA then go with the b18c swap. The b16a is low on torque and you might not like it driving around town. You can reuse the mounts, axles and linkage. However you should try getting the wire harness, if not you'll need to add wiring for vtec, knock sensor and the secondaries.

I suggest you just use the money for a good turbo kit. Many people are happy going that route. Sooner or later you will get the turbo bug.