It also depends on what you want to spend as well. When my ludes USDM H23a1 blew up I thought about an H22 swap but found an almost new JDM DOHC h23a3 for 1/2 of what an H22 cost. With cold air induction and other mods it has more than enough power for my needs and runs like a top. So i guess the lesson here is figure out what you want out of the engine, If you want to race or if your only need is good overall performance. And also what you want to spend vs your goals.