Depends what you want to spend and what kind of integra or civic you will get, LS, GSR, Si...etc. You might go with a more affortable B20 and those are pretty fast, or you can go all out and put in an H22a thats really fast but it costs.
Better think first what would fit you as a driver. Different drivers prefer this and that but you should determine what you really want because you're not just spending on little cupcakes that you can throw and change right away. To canvass about cars, I suggest that you canvass first. Hope this site would help.