KA24E sucks, only because there is basically no aftermarket support.. KA24DE is a good motor, with much better aftermarket support... CA doesnt have as much support as a SR. RB has decent aftermarket support and generally cost less then an SR but.. takes alot of money to make fast. SR cost a decent amount to get into but is cheap and easy to make fast... due to aftermarket support it is basically my favorite... but having a KADE to pop and throw away at 300 or less each is kinda a nice feeling, im sure.