If I was in your position, I would put in a JDM K20A-R. Engine mounts have been made for this swap already and it should give you more than enough power. It has 220HP stock, but unlike other engines, it responds extremely well to bolt-ons. I mean I have a H22A and installing an intake, and exhaust barely make a noticable difference. I have heard that on a K20A-R, it makes a big difference with just normal bolt-ons.