If your going with turbo get either the b16a or b18b (cheaper and both make great power with boost)
If your going to keep it N/A then by all means get the b18c. The b18b and b16a are not the best choices for all motor (since you did menton that ls/vtec was out of the question).
If your undecided about asperation then go with the b18b. If you go n/a you can add a b18c head and make good power and if you go with turbo you'll make even better power.
the b16a is good ONLY if your boosting (IMO)....LSD is worth every penny.