It depends. Only mods you will need for a h22 is a mount kit. The handling problem with the car and a h22 in it, isn't the as bad as everyone thought, but the motor STILL sits in the bay weird, so you will lose power off the start for that.
You can go somewhat considered cheap and use all oem teg mounts and swap a b-series into your civic. That way, you aren't stuck with 500 for a mount kit.
Depends on what you want..
drag = h22
autoX = built up b18c1 (you can go b18c5, but those get pricey (4650-5500)
A motor with torque and power, but will cost you some extra money is a CR/VTEC (b20 crv bottom and vtec head).. If done right, these can pump out 240 or so.