Hey Talej,
I feel for you mate - I know exactly what you are feeling. But hey we got to realise that when you start modifying cars - shit happens.
For Example:
I spent $XX,000 upgrading the top end and ancillaries of my car to take it from 150rwkw to 240rwkw - then the engine went bang/pop/splutter/poof.
Now I am spending nearly 2 x ($XX,000) to fix it properly. The further down the track I get, the more $$ it is costing me, because the more things I find out are busted or weakened.
The reason for all this is - when you modify one bit it puts stress on another , which you have to modify , then this puts stress on another part, etc, etc.
But hell, I have learnt some very valuable lessons about modifying cars along the way.
The fundamental and most basic rule is (if you don't know exactly what you are doing) - find a shop/mechanic that you can trust and that tells you the truth - no bullshit. (this is the MOST IMPORTANT decision you need to make before making ANY other decisions on technical shit like what ECU, what turbo , which injectors, etc, etc)
Get them to listen to your goals - give them your input - get them to make recomendations to achieve your desired objectives.
If you trust them and they tell the truth, all the rest will fall into place - even if there are fu(kups along the way - you will always know where you stand.
And yes - always budget on spending 1.5 to 2 times as much as than you originally think when you start modifying a car !
Hope it all goes well for you mate !