If you are looking to spend 4-5k on an e30 I'm sure you can get one that has some work done to it. Just last december my friend sold his e30 vert NO RUST and motorized top with 204,000 kms on it for $2900. The car needed new shocks that was it. Sit tight and you will find what you want.
I would even consider looking to pIck one up in the states.
Good luck with your search.
There is also a thread in the e30 section regarding purchasing an e30, check it out.
I'm sure others on this board will agree with me when I say be careful these e3Os are addictive and can make your wallet seem lighter lol.