Well, boost shouldn't be your first question. You will spend a lot on mounts and various other parts getting the H22 to fit into your Civic.

The B20B will drop right in after changing to some other OEM mounts and getting the necessary items. The B20B will likely run better with boost because of its low compression and considering the proven power made with the B18A/B turbo applications on OEM internals.

Boost power is also relative to many other attributes of the engine. A motor with OEM everything and the basic fuel management will likely make good daily driving power at about 10 psi. The more you do to the internals and fuel management, the more you will be able to get out of the engine and the more boost you will be able to push.

Throwing a (insert make/model/specs of turbo here) on (insert some engine code here) is not a straight-forward question and is not something that you can just blurt a whp number out at. You need to research the different kinds of turbos, figure out what all you will be doing with the engine, research different fuel management components, and decide from all of that what you want to do. There's a million choices and combinations, you just have to figure it all out.