definately go with R34, to me the modification are quite expensive
if not engine modif, what else could it be

buying 2002+ bmw M3, its like those peoples that like driving 2000 model BMw with chromies wheel, even if its m3, i rather get new face bmW

and i think skyline v35 are more popular than 350z thse day, i m not sure but
i reckon modified V35 looks better than 350z