you should also consider what will blow up with a engine swap.
matty has a 7k with webers in his ke30, blew a k50, cracked the shits and put a w58 (i think) townace box in it with a r31 lsd rear end.
mostly depends what your driving style is like.
turbo 7k i would be thinking a tricked 3 speed with a decent sized stall convert..