Fc's - around the $2500 range for non turbo models, my friend use to daily his so I assume they're reliable.
240's - around the $2000 range for an S13, a good friend of mine has one which is also his daily, I've driven it before... no power! but a pretty nice car none the less, and with 205k miles on the clock I'd imagine they last!
e30's - not a bimmer guy, but they seem to be in the $6500-7500 from what I've seen anyways
miatas - not a miata guy either, but they can be pretty fun track cars.
maybe supras - honestly it's hard to find one in good condition, I bought mine almost a year ago and it was in pretty rough shape. I've put alot of time and money into it to get this far, and I'm still not done. But I guess you could say that about any car.
if im lucky a '75 or earlier 240/260/280z - good condition Z's can be found for around $5000, so it's not impossible! If it's really what you want then my advice is to keep saving up. You don't want to be kicking yourself down the road.