you could swap a JDM engine, but reuse your own injectors to have no problem.
You will end up with a bit more powerful engine due to bigger turbo. or you could use an ECU off a manual car and use the JDM injectors that are 450.
If you are doing the work yourself which is pretty easy, JDM could save you 1K and if it is bad, you could just take it out and ask them for a new one.
I have had good experience with JDM but some have had bad experiences.
You should also use your own intake. just undo the intake and bolt it on the new engine. all good!
to the cost of the engine, JDM engine that is, you should add stuff like timing belt too.