There are a few things I've learnt along the way that may be helpful.
1) Decat both with a 1.2bar Restrictor Ring. No need for a boost controller as you can hit 1.2 bar without it. BC's only raise the boost, not lower it. You may be able to get a slightly more aggressive gain on the boost with a BC, but when I was BPU, running with BC on and off was barely noticeable, so save your cash for other mods.
2) FCD - Once you start raising the boost, your standard ECU will try prevent over boosting, so get one of these. The moment I decatted I hit boost cut, and it's fairly scary when you're not expecting it. (I'll have one for sale pretty soon)
3) AFR, EGT & Boost gauge to keep an eye on fuel, boost and temperatures. These are optional but advised.
4) Cat-back exhaust.
5) Replace your SMIC with a new or aftermarket SMIC. You don't need an FMIC with BPU, and all it did for me was add a little lag and costs a bomb.
Notes: Don't bother with a fuel pump unless you're planning future mods, as the standard one is up to the job up to about 1.2 bar. Don't exceed 1.2 bar as the injectors, turbos and fuel pump are all pretty much maxed out at that stage. Don't replace the FPR as the std one is fine. Don't waste money on "branded" spark plugs etc. Get a decent set of copper plugs. There is a thread in the technical section on these.