Questions.....

Is the j-spec engine worth the money you spend? I've heard alot of people talking about having a j spec swap into there car. Also can the usdm and jdm engines handle the same about of boost stock? I've been thinking about getting an mr2 for a long time, not really because there fast but because of the handling of the car. i never actually drove or ridden in mr2

If you are in the United States, I wouldn't bother with the JDM engines.
You can get plenty of power of the US motor and parts are much more available.