My advice from having hybrids (which are now for sale:d ), and now having a single turbo, is save up and up to the point when you thin kthe wait is gonna kill you, and then make your decision. Trying to do stuff to a set budget doesnt work.
Always prepare for the worst, the most expensive outcome, and the most realistic. That way you wont be too distraught when something suffers a hiccup in your plan, you wont be out of pocket with a half done job because you werent financially prepared, and you wont be dissapointed when you dont make 800bhp for £3000 just because someone reckons they know different to all other tuners in the world ever!
This is the voice of experience telling you this! Dont fall in the same hole I did.