why does it all come down to rape? hahah.

you need to be more specific in both your reasoning and your goals:

what is your current situation - how much money do you want to spend, what condition is your b18c in?

are you looking at a k24a3? or k24a3/k20a2 hybrid?

i wouldnt be doing a swap like this unless i was considering the latter.

how much power do you really want/need?

if you are not looking for huge gains have you considered working the engine you already have?

Bear in mind that a k24 converted dc2 will be significantly harder to sell than a worked b18c dc2. this might be important to you, or it might not.