this thread is a bit of a mess. lol
first of all the OP hasn't replied to the thread, or given any sort of context as to how we should approach this question...
anyway, for a small car like a rex/civic/delsol, the d16z6 will give you a decent amount of power. If you want a bit more, you should look into a turbo for the d, or a b series swap... usually this means LSV or a gsr swap. (others are b20vtec, b16a, b18c5/7)
and i would think the best d-series would be the dohc ZC.