yea greg had that black S13 with the RB26.
As for budget, i'd allow atleast $10000, ATLEAST.
The labour will probably kill you on it, best case scenario, you'll be looking at around $80/hour, engine - $6000?
I think it'd be atleast (never talked to anyone about doing it) 6 hours labour or something, then the wiring/auto electrician, parts fabrication, engineering (i payed $770 for the certificate and inspection, ended up paying around $1200 all up including certificate, inspection, and mods). So save your pennies and don't really consider it untill you have more than 10g's up your sleeve.
this sound about right to you lot?