Keep it stock for a few months at least first is my suggestion. I've just been through the same thing.....gone from owning slow fwd cars to my first turbo RWD car....my GTT
Even standard they are quick enough and i highly recommend driving it round until you get used to it.
If you want to do cosmetic mods first then go for it. The BOV is a waste of money IMO as well...
After you get used to the stock power just do what GTST said (he seems to know his shit ), and 200rwkw will be great fun!
And trust me 10K won't go far, especially if you're buyin rims n tyres as well as performance mods.
But overall you will love the 34 when you get it, I know I do!!