dont worry about a FMIC, it will just make the std gsts slightly more laggy...
when you upgrade the turbo, then do a FMIC, but its not essential for a slight boost increase and an exhaust...
spend the money on the wheel bearings..
the suspension, wheel bearings and brakes arnt minor thing, for me they are almost more important than the engine...
a secondhand engine is $1500 plus install, secondhand suspension and wheel bearings arnt worth the hassle, so new ones will cost more than installing a secondhand engine...
then your castor rods will need doin, then rotors & pads, then service time, and a coolant flush, probably suspension bushes will be flogged too... the engine is really the last of your worries tbh... not to make it sound bad but if your using it as a daily you will atleast want it safe, reliable and a pleasure to drive...