CA18 is cheap...but going from one problematic motor to another doesnt seem like a wise choice. i can find you a SR20DE FWD for that price..or maybe a blown RWD SR20DET w/ 200k miles, no turbine, no harness..and automatic

heh..just rebuild your KA24DE and it will be good..
SR20DET will require much more maintainence than your NA KA24..as with all turbocharged cars..

if you can show us that you can maintain you KA24..and keep it running in optimum condition..then maybe you can handle a turbocharged motor..

good luck man..you're gonna need it..peace bro