my personal opinion would be to turbo the 1.6 with parts from theese guys ...i got alot of parts you need... and russ and matt should have what i dont...
but if you must swap.. a b6t is easiest i would say, and then a bp.. but id get a complete harness and engine /tranny doing that,
the kl-V6 will go.. but its a hella project.. but id give big props if you did it...
how skilled a tech are you
and what do you want as an end result???
i think a b6t would put a shit eatin grin on your face and is the easiest route....