Welcome mate and what a nice story.
I would complete the mods you've listed for now and then practice, practice, practice. Get the car to a point that it's reliable with the uprated parts and then learn to to drive the thing.
Once you can't go any faster with that set up, I would look at:
- high quality coil overs (AST, MCA etc) and accompanying suspension set up/alignment
- more powah (ECU tune and exhaust)
- half-cage with appropriate race seat and harness
I race in Production Touring and most of the cars are very fast, even with the limited mods we're allowed, with the money being spent on safety gear, suspension and brakes predominantly.
Enjoy the journey and keep us updated!