I cannot insure the SR20 versions. However, upon my research on the CA18DET, is it praised by a lot of people. It has been said that it is near enough an RB engine but with 2 less pistons. It has an iron block and a square design which allows for a very high rev range.
Sounds good to me, even if it is 170bhp stock. I do consider that quite high though, for someone of my age anyways.