Newbie needs info chosing motor for my 92

well i am very new to these cars, but i just picked up a 92 hatchback with the 1.5L for cheap. it should work well for a daily driver. i dont know much about anything. what do i want to do? i have NO plans to race it. just good transportation. should i get one of those Japan imported used motors? should i swap a different motor? i want to keep the stock 5 speed in it. what should i do?

i feel uncomfortable about buying a used motor. they say about 500-600 for a motor that has been "tested" and warranted for 3 months. are these a waste? i would like some good milage with it.

thanks for helping out a newbie. i hope to stay here for a while!