I would go the CA because of its size, weight, look and its ease to pass engineering. There are plenty of kits out there to fit the donk into just about any car at reasonable prices, With forged pistons and good rods it will be an exrteamly reliable motor and they also have a very easily tuned factory computer so that can save you a few bucks. This motor basically gave birth to the RB series donks you see in all the R32, 33 ,34 skylines out there so it has a pretty good start to life. One of the down sides it that there is allot more after market gear for the SR20's but thats only one small hurdle to jump over. This is just my opion so you can take it any way but I hope this info helps you.