personally i would turbo the D16, here are my reasons:
-i think its a much easier process than to swap in an H22
-once your boosted, you have nearly limitless potential
-since you plan on piecing it together-that means you set ur HP goal and get the right parts
-there's nothing like whoopin' the sh*t out of people with a single cam 1.6
-in comparison, if you get the swap and bolt on parts...the potential of those bolt ons can't compare to crankin' up the boost