welcome to the forums . off topic but why didnt you just keep the s13 for drift . its a proven format. and 9/10 times it works out cheaper to mod then any toyota E series chassis.
for a budget . i would start with the basics :
motor - 4age 16v stock rebuild
gearbox- t50 reco
wiring - standard jdm loom .
diff- locker . or t-series + 4.7 c&p +2way
suspension- HSD coil over kit front and rear. +adjustable pan hard rod + wheel alignment
tyres: 14s or 15 wrappedin bridgestone re001 or something on par with it .
more then enough to get it track drift ready .
use this setup until you maximize it, and spend you time off track reading and researching about fine tuning your setup.
learn to walk before you run . will save you coin and allow you maximum track time .
my biggest mistake was getting caught up on the best setup and now im finding my self going backwards and spending more money then i needed when it could be spent on track days.