Like everyone else has stated, you will be pretty hard pressed trying to find a good Jap turbo car for 8k, particularly ones that are 1989 or newer. The only thing that will probably come close is a CA18DET Silvia, or a f**ked 180sx, but they will need a bucketload of work. Same with the R32.
You best stretch your budget a little. When I bought my 180sx, I was originally looking at spending around $16-17k, but all the 180's I looked at needed a slight amount of work, whereas the one I bought, was for $19.5k, and haven't had ANY major troubles yet, and it's still going strong.
Good luck with whatever you buy though