Remember you get what you pay for. There is always the option of ordering a JDM GA16DE motor from an importer which last time I checked was $475 plus shipping and they are already compression tested before sold and have low miles on them. Thats what I'm planning to do before summer. But I'm also doing the entire drive train including tranny, clutch, flywheel, and differential. Just ask yourself a question, "is the saved money on getting a used motor you know nothing about worth the risk of having to do this all over again in the near future?".
Mitch
Mitch