Heres how i feel. in order of fav to least fav per category.
Turbocharged:
B18B
B16A
B18C1
B18C5 - easy to turbo, just takes
a lot of tuning. doubt me, go ahead. ill prove you wrong.
All Motor:
B18C5
LS/VTEC
Supercharged:
if i was strapped for cash however, id do a cheap yet effective swap - D16Y5 turbo.