Ok wow be wise with your hard earned money!
b18c5 is what, $5000 or so?
Around 1k for engine/tranny/ecu install?
Headgasket, assuming you install yourself what, another 100
if you get it installed thats at least 500, eh?
So you are looking at 5100 if you install everything yourself, 6600 if you dont.
b18c1 is like 3000 install 1000
pistons/rods 1500 install 750
intake manifold 500 if you cant install this yourself
So that is 5000 if you install yourself, 6750 if you get everything done for you.
The PP will cost 400 more on the b18c1.
So everything costs the same, just installation costs more with the b18c1, but that is because you are getting top-notch high-quality parts, not just replacing a headgasket. With these good parts you can run more boost and be more reliable, and not have a half-assed cars like so many Hondas are.