word.
the 240SX is perhaps the most overrated car tuned today, IMO. Just realize they aren't some "jr. skyline" or whatever and you'll be fine. You can pick up cars in need of an engine all day long for $500, spend around $300 on a used KA and there you go, $900 RWD beater. If you're into drifting buy a $150 pathfinder spool, some drop springs and sway bars and you're still under $1500. Otherwise you can pick up a used diff for pretty cheap and save for good parts.
start asking around on 240 forums, even zilvia. This probably isn't the best place to ask for 240 stuff, I think they're only two people on here who have them and tune them.