A lot of the point is that especially in the hands of someone without a lot of practice (sorry, don't know you're history) more power is rarely the answer to more speed on track.
Controlling wheelspin is proabably my biggest obstacle on track, and I have a bone stock engine. But as I am already using 90% of my available grip for cornering...
Seriously, if you get more excited about power than AutoX speed (and that's OK!), then by all means go FI and have yourself a blast. But if you are more interested in speed, that money is better spent elsewhere.
Don't waste another minute waiting on parts, or anything else. Just get out there and start racing! You will suck at first, and you will be slower than many other cars, but the only thing you will regret is not starting earlier...