the H22 is heavy and unless you go hardcore turbo, the power will no offset the weight. Plus you will ruin the balance on your Civic.
The B16 should be a straight bolt-in. The Si came with one, so if you can find a decent front clip, just swap everything into your car (manual transmission included). There won't be any tricks, and no fab work. An H22 can't offer that.
You might be able to get away with a B18, but it is taller. It will probably fit, but won't be as plug and play as the B16. Since off-hand I don't know the exact differences between the engines, I can't say for sure.
If you can afford it, the K-Series is the way to go. A little bit of research and you will have an exceptionally fast car. In Florida, I bet there are people swapping in K24s into their brand new Civic Si's. If you can find one of those engines, you will be in business.
The B16 is your best bet. Find a junker and make a DIY Si.
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"I really like going fast. Just go off and meditate in the wind, you know? As corny as it sounds it works and feels good. It's a good way to just let the weight of the world off every once in a while...is this a big pose? I mean, yes this is a pose! I mean am I driving down the street to not get noticed in this thing? I mean rebellious is what this thing is I would say!!!" -James Hetfield

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