The B18 that are in integras are great engines to modify. B18b is a great turbo engine because of the low compression. B18c (GSR engine) is a great engine for all motor and can be turbo'd to a certain extent without problems. With the numbers you are looking for, you would need to swap lower compression pistons into the B18c among other internal parts. With the kind of power you desire, I hope your wallet is relatively fat and you understand what you are getting into with that kind of power. The more power you add to that car, the drivability and reliability become less and less.

In terms of modding a base model LS sedan, I would go with the coupe. Much lighter and they look better, IMO.