I've just read through this thread properly now..... You seem to know what you want out of it and it appears you've got cash to throw at it... Lucky for you, it's going to need it, it's difficult to mod an already modded engine and not know whats already done, for your sake i hope the previous owner can help you out.
You seem very excitable, bit of advice, stop being so fecking defensive every time someone says something you don't like, there has been quite a lot of quick, useful advise posted here already, not all of it has been useful in your eyes but then just ignore that and lap up the good stuff.
There are people on here who have worked for VW, tuning companies, prepare track cars etc, already you appear to be rubbing some of them up the wrong way by over reacting to what they are saying to you. So take a deep breath and enjoy being on one of the most useful sites I have ever been on which comes with some great characters, sarcasm and a bit of humour all for free. That's what this place is about if you take a proper look.
Shaun